[Taro]

I've seen plenty of warnings for proper installation of these things...if you don't do it properly, it can cause all sorts of alignment issues with the door.

As for how it feels, it's extremely subtle, and you'll probably only notice if your car is otherwise stock. Once I put a strut bar in, I completely forgot I had these. It does change the sound when you close the door, though. It's not quite at "European-car-clunk", but it's a lot more meaty sounding than what it used to sound like.