wow... sorry everyone, I havent been around in awhile.. I thought my thread was dead by now!! haha
To everyone asking, YES.. ride quality is reduced. Do I really care much at all? Nope! Maybe its cause I'm young, but I don't mind having a rougher ride. Hell, I have an R6 and a 240sx slammed to the ground (VERY rough ride), so to me, ride quality isn't a huge deal. On the plus side, though, I get comments from people all the time that ride in my car that it has an AMAZING, smooth, ride. (what they DONT know, is that the stock ride is even better ;) ).
Highway riding is not bad, road noise it more apparent, but even with music off, windows up, a/c on, its not very noticeable. You need to be more careful when it comes to bumps and dips in the road, you don't want to bend a rim. (By the way, besides my 240, I have a F250 with 24's and a Jag XJ8 with 22's, and have never bent a rim, but I know it can happen.) You will get the learn what roads are worse in very short time, and avoid them.
Jcrome, car is holding up great! thanks...
condensed version: 20" rims make ride a little harsher, obviously, but I think it's worth it. (harder on your brakes and hubs, though) Road noise is increased, but not by much. if you like the look of 20's, check them! You will not regret it. If you want a real clean, good looking compromise, get 18's and lower that thang!