Wow ive never heard of an IS having that many problems. I bought mine new in 06 and i havent had a single problem yet.I would expect that many problems out of a 1995 BMW, but not a new Lexus. Maybe this will be its last problem, just think possitive!
About the windshield cracking, ive never heard mine crack. My brakes sqeal a little bit, i can hear it a little with the windows open and thats it.