Just installed this today, so far it's working well. A little difficult to figure out what you need and how to program. For my 2007 Dodge Caliber, I needed this DB-All, an XL202 RF module, a CHTHD2 T-Harness R9, and an XKLoader2 to flash the firmware.
I was using the XL202 one-way, which means I only sent signals from my factory key fob to the car and not from the car back to the fob, so I didn't need an antenna. Your needs may vary.
On the wiring harness, they have part numbers on their site in the installation manuals. Use the make/model selector and find your installation manual. THOUROUGHLY READ THE MANUAL BEFORE ORDERING ANYTHING! As I said, this is rather tricky, and some models do not have a plug-n-play wiring harness, which would considerably increase installation time. I'm an industrial electrician, and even I didn't want to mess with splicing some 12-odd wires under the dash on my back... I had to check my ignition switch wiring harness inside of my steering column ahead of time to verify that the CHTHD2 would work. Again, do you research, this is not an off-the-cuff project.
Directions for flashing the correct firmware to your DB-All are also on their site, along with the free IE add-in to do so. If you have trouble flashing, try setting compatibility mode for IE if you're using a newer version (it's in the troubleshooting guide). I don't think the add-in (XPressVIP 4.5 at time of writing) is compatible with other browsers.
Upon installation (follow the directions, and connect wires in proper order), mine did not work. After a little more reading, I had to reset the module and then program again with my factory key. Also, the safety disable toggle switch was in the 'off' position. After this, worked flawlessly. I have yet to hook up parking lights (which have to be run through a relay, I'm assuming because the output of the db-all can't supply enough current for the bulbs without frying). You can buy one cheap at an auto parts store.
I spent $100. This is gf's Christmas present, though I gave it to her early; just couldn't wait and it's cold! :) Saved $200 by doing it myself. Spent 6 hours total, but 2/3 of that was reading and research. Actual install only took 20 minutes. Hope this review helps someone else save some time!
Edit: I suppose I should mention I'm using this as a remote starter in what Xpress calls RSR (remote start ready) configuration. Works great, and you don't have to sacrifice a key.