We bought our trailblazer used in 2006. We haven't had any major problems with ours. The 4X4 switch is known to go in them. We had that replaced once or twice, but I know once was definitely while still under warranty. Another thing it is very touchy with is the check engine light. Every once in a while the check engine light will come on after getting gas. I have taken it to get checked several times to find this was the only problem, but it does clear on its own. We had another weird thing happen that was an easy fix. Basically, our battery died once and when we charged it up again our check engine light came on, and at an idle if we had the air on it wanted to die. After changing the alternator, thinking that was our problem, we delved a little deeper and realized it was a dirty throttle body. We had mechanics trying to tell us the computer needed replaced and all kinds of other things. A few dollar can of cleaner and about an hour's worth of work, it was running great again! I'm surprised to hear people complain about the seating/roominess. For the size vehicle it is, I like the seating and feel there is enough room and I am not a tiny woman. Prior to purchasing it, I did research as well and I can't recall now what it was, but there was something odd with the 2002 model. I think it had something to do with a weird hum at about 45 mph. If you google problems with 2002 trailblazer I would think you would find it. Other then the above mentioned problems, it has been an excellent vehicle and I believe we have about 140000 miles on it now. The only complaint I have on it is the mpg's. When we purchased this I was going in between this and an Avalanche. I opted to go with the Trailblazer because I wanted better Mpgs and although it is slightly better, it wasn't as much of a difference as I thought it would have been. My sis-in-law bought the avalanche and when we drove to Disney, her truck didn't use much more gas than my Trailblazer did. Other than that, it has been a good vehicle so far. Best of luck!!!