Had this from day one. Just had dealer replace the exhaust manifold ($100 cost to me, could have beem $770). Cracking of the manifold is common, rear of the O2 sensor. If you smell exhaust under the hood when cold and freshly started, as well as a strange noise that clears up in 3-5 minutes, you have the problem. GM covered this up to 8 years and 80K miles for free, I was lucky to get for $100. Thanx GM :) Replaced all four antisway links myself, easy (gets rid of clunking when going over bumps). Also had to replace all four brake rotors and pad sets. Very happy with the Rugged Trail T/As, 94K mi. on the remaining orig. pair. Installed K&N cold air intake kit, no diff in econ.
Traded in 97 Astro for 04 LT EXT. Expect a truck like ride, 3rd row seating is easier and sits better than Tahoe. We like it overall. We live in Texas, it does not produce cold air until it is moving. Dealer says that is how it was designed, still looking into it.
The test drive was fine, but actually using the vehicle was another story. Gas mileage is poor; we get about 9 mpg pulling our camper and about 14 mpg avg. highway & city. The suspension is soupy; it wobbles a lot around corners & over bumps. The storage is appalling; I can't carry passengers, a stroller and groceries; there just isn't enough room. The stroller also falls out when I open the back hatch since it is crammed in. Having two car seats means the seat which allows access to the back hooks the car seat when you try to fold it down. Folding the back seats down is no easy feat. Not enough storage for little stuff. Little to no leg room when purse, back packs & diaper bags are stowed.
I love my TrailBlazer, the extended version. Great family car seats 7. Great in the winter weather. I hate that I have to turn it in in July, but I can't afford the gas. But don't judge by me, as I am a single parent. So with a family with two incomes don't be afraid its a great vehicle!