I have not had any problems. With 900 miles in 6 months I don't think that's a enough time for any to crop up, but if I had it to do all over, I think I would have gotten the GS.

My wife loves the IS, but for me and I'm not a big guy, I like the GS. The IS is a GREAT car, don't get me wrong, but for me, I would have preferred the GS. I don't guess it really matters anyway, she drives it and I drive my 13 year old truck!