To begin, I really love the experience off using the Apple Pencil with my iPad Pro. It would be great to see Apple expand the ability to use the Pencil with other versions of the iPad (although, that would reduce the utility and niche of the iPad Pro to a certain extent, in my opinion). While Apple touts the lack of lag in drawing or writing with the Pencil, there is a noticeable lag. This is not like writing with a pen on paper. With that being said, the lag is minimal and does not detract from the experience of using the Pencil. The Pencil is even weighted on one side so that it does not roll off the desk. You can also charge the pencil directly off the iPad Pro, and it charges very quickly. This is a great feature that is not available with other third-party stylus devices.
With all that being said, I do have some minor annoyances with the Pencil. First, charging it off the iPad Pro is challenging on anything but a flat or stable surface as the Pencil literally sticks straight out the side of the iPad Pro. I am paranoid that I will either hit the Pencil or the iPad Pro will fall and the pencil will break right off from its lightning connector (potentially damaging the very expensive iPad Pro in the process). Given the use of inductive charging of devices these days, it would have been much nicer to see that as an option. That, or I would have preferred if charging would have occurred using a male-to-male dongle between the iPad and the Pencil. That would avoid the need for an adapter when using any lightning cable while also addressing my fear of breaking the Pencil while it dangles precariously off the side of the iPad Pro. There is a way to plug the Pencil into a lightning charger, but only by using a very small and easy-to-lose adapter (female-to-female). Also, when charging, there is no place for you to put the Pencil's very small and easy to lose cap. The cap attaches via a magnet to the top of the pencil, which is actually fun to play with when I'm bored or fidgeting at a meeting, but the magnet is not that strong... Meaning I can see how it would be easy to dislodge the cap in routine use or, more likely, transport, which would result in losing the cap entirely. There is nothing you can do with the small cap while charging the Pencil (unlike some other similar devices which allow you to attach the cap to the other side of the device while it is charging. One other thing about charging... I would be nice to be able to see somewhere on the pencil how much charge is left. Nothing is more annoying than going to use thee Pencil to find that it is not charged. Some LEDs on the side or something would have been appreciated. As it is now, I have no idea how much charge the Pencil has in it. The only way I know it needs to be charged is when it stops working entirely. Again, it charges quickly, but it is still a huge inconvenience.
While I have not used many other similar devices, it is my understanding (from reading other reviews) that some of them allow the user to simply flip the device over and "erase" with the back end of the stylus (as opposed to having to select an eraser tool within the app you are using). That would have been a really nice feature for the Apple Pencil. If it really wants to replicate the use of a traditional pencil, the ability to quickly and easily erase mistakes is a must. That is not a feature of the Apple Pencil, however, which is too bad.
Ultimately, the pencil is great to use with the iPad Pro and is probably the best stylus-like device I have used. I like the weight of the Pencil which seems just about right... It has just a little mass to it so that it feels good in the hand, but is not overly heavy or bulky. It feels like a pencil, actually (albeit a completely smooth cylindrical one). The Pencil did include an extra tip and the female-to-female lightning adapter to charge the Pencil through a traditional charger. Now, all I wish is that Apple had included something in the design of the iPad Pro (or one of its cases) that would allow me to carry the Pencil along with the iPad. As it is now, the Pencil does not connect to anything when it is not in use, meaning I have to physically carry the Pencil with me, separate from the iPad. It is essentially the shape of a pencil... Who carries a pencil with them? Usually, I have a pencil or a pen in my portfolio (which has a nice, little elastic strap for holding the writing utensil). Not so with the Apple Pencil, which does not fit comfortably in a pocket. At $100, the last thing I want is to lose, drop, or forget the Pencil somewhere because Apple did not consider it important enough to accommodate storage or transportation of the Pencil along with the iPad Pro. Just one more thing to consider.