I'm thinking of getting the 1" kit also. John, can you give an impression of the kit? Does the seat wobble at all or feel as solid as before?
I just put it in yesterday and have only taken it for a short test drive. So far it seems fine, but then I haven't engaged in any "spirited" driving yet. The directions are relatively poor, as noted on this site by many others, but the install went pretty smoothly with a little time allowed for thought (to fill in the instruction holes). I don't know why they haven't incorporated a mount for the seat position sensor on the new cars. Maybe they just need some time to get around to it.....
If I don't get any good feedback on this post, I may just pull the seat back out and make my own mount for the sensor. Right now I have the airbag error light in my dash reminding me that the sensor isn't plugged in....