I installed the ST810. Did it myself. Ran into a few problems with the ignition wiring and I also changed some of the other wiring just for the sake of better suiting it to me. I installed it on an '06 Tiburon GT, if anyone has questions for me keep that in mind because I think the wiring colors changed at some point. Its working exactly as described and is amazing. Only complaint I have is the stickiness of the tape that secures the button/ring and the window keypad. I'll probably get something to replace those stickers so that it doesn't move anymore. Otherwise I am quite enjoying it
P.S. I went with the 8 series rather than the 9 series because I didn't want to have to charge the remote battery every couple days.