I drove one with a clutch-stop the other day, and was quite impressed with the way it drove. Seemed to make the shifts timed a bit better, given the RPM's have less time to drop before your foot comes back off the clutch.
Luckily the switch to start the car isn't all the way at the bottom. It actually triggers that fairly early into the actuation of the clutch. Start off assistance won't be bothered at all (just requires the car to be in gear, brake on, and clutch in).
I'm considering putting one in my car after driving the other one. Rominl: thanks for posting the review. For $14 bucks you can't go wrong and you're really not a loss if it's not for you.