I am an owner of the TI Nspire CX CAS. I loved it. The HP Prime is my new favorite though, the touch screen can't be beat. The active community adds to it's charm, with so much customizing available, games, 3d graphing, periodic table, on screen qwerty (why isn't this already loaded?), Etc... The calculator is lacking in functions when compared to the Nspire, however it is superior in hardware in every way. Also it's easy to compensate for the lack of functions by downloading some programs. Build quality is excellent and it is much more enjoyable to hold verses my Nspire. I use them both right now, the transition between User Interfaces can be a little difficult, it is lacking in the functionality overall, wish it wasn't limited to 10 of everything. The TI can go all the way up to 99 equations to graph. I know the HP can do better, so why isn't this changed in the software yet? That's about it. I still love the Nspires PC layout though, can't beat the spreadsheet and list mix, HP should take a real hard look at their competition, but the community still compensates for it. For now anyway they are super active compared to the Nspires.

it was a difficult choice between this and the ti-nspire cx cas. i ultimately went with the HP because i really dont like the menu based interface on the TI. the HP feels more like a calculator and i was able to much more easily do basic everyday calculations on it. and thanks to the easy to use help system, i was much more quickly able to figure out more advanced functions as well. The cas system works well for both, but im not sure if the TI has Laplace and Fourier transforms. however, the HP doesnt have good 3D graphing either (despite what appeared to be a promising 3d graphing app online) while the ti does. it also took me a while to figure out how to properly create and use custom functions. once i had it figured out, however, ive found custom functions to be incredibly useful and easy to set up on the HP once you know how. i would also appreciate a bit more info on defining custom user keys, as the system doesnt appear to be as extensive as i'd hoped. so far ive only been able to define custom user functions onto number keys. I also havent delved much into programming this thing, but it does look like it may have more potential in that field, especially since ti started locking theirs down. however, available software is limited and ive found that downloading and installing other users programs is a far more complicated and buggy process than i would have liked. if not for TI's crackdown on their own programming capabilities, i would say they have the better system, but since i plan on learning to program this thing myself anyway, i decided to go with HP. The HP also seems to provide clearer answers in terms of roots or pi more often, and is easier to switch between numeric and symbolic representation with these answers. however, the ti was more intuitive when it came to using complex(imaginary) number conversions in exponential or trigonometric forms (still possible on hp, just less intuitive), and neither calculator performed well when taking limits at infinity. my recommendation would be to thoroughly test both out using the emulators (30 day trial for the TI) before making a decision. also keep in mind that as nice as the mouse is on the ti emulator, the touchpad on the actual unit is absolute garbage, while the touchscreen on the hp is actually pretty nice. that said, probably one of the bigger deciding factors for me was the emulator itself. i really like the emulator for the HP a lot more than the ti. and its very easy to do work on the emulator, or take notes, or design a program or function or user key definition, on the emulator, and then transfer it to the actual unit. i actually decided to get the HP when i decided that i would be using the HP emulator a lot more than i would the ti. even though the HP emulator was free, i wanted a handheld unit for exams that would sync with it and that would allow me to use the same interface in both environments. either way, both calculators are way overpriced and unless you need it for exams in college, i wouldnt get either. ultimately, i still think its a great calculator, but its not a clear winner over the ti.

For users of older model HPs, this calc really takes getting used to. The trick is watching online tutorials, which are essential. Once those are done, this machine has neat features: (1) Lightning fast execution of commands and plots. (2) Statistics, hypothesis tests are well-done. (3) The CAS, a subset of Xcas (by Dr Bernard Parisse, Univ of Grenoble) is outstanding. Limits, derivatives, integrals, difeqs, laplace/inverse laplace are returned instantly. This is the fastest handheld CAS available, period. (4) Programming use-defined functions with the Python variant is straightforward. There are a coulple downsides. (1) To appeal to a younger generation, it has a touch screen. It's fun, but like a phone, you have to clean the streaks off every so often. (2) The rechargable battery has a decent life, but you must keep an eye on it. If you're a student, the last thing wanted is a dead battery in the middle of a test. There's no changing of batteries with this machine. All total, this is a marvelous machine worth trying if you want to upgrade a graphing or CAS calculator.

I am very happy that I bought this calculator. It does everything from graphing complex functions to unit conversion, solving quadratics to simplifying integrals. You can create notes (I’ve made a note with a list of integral formulas). The fact that it has a touch screen makes the user interface so easy to use. Also, the battery lasts quite a while between charges. (I use my calculator every day for about two hours and charge it every other week.) Overall, just a really well made, easy to use (once you’ve learned the syntax of different tools.)

This is definitely my favorite calculator so far, much easier/faster in my opinion for doing vector math than the TI’s, the TI’s do seem to have more content and I like the documents in the Nspire, but the Prime is much more intuitive to use and has the majority of necessities assigned to a button, where they’re in a list for the Nspire. There are a couple of downsides, first I had to return this calc twice, to receive new ones due to issues... if it wasn’t this good I would have stopped trying after the 1st replacement. I think it would be excellent to see them integrate a full keyboard like the Nspire but it is what it is. I still own and use my Nspire, but the prime has taken the spot for my go-to use all of the time workhorse... just had to find one that was reliable.