I have owned this truck for a little under a year. I have put nearly 11,000 miles on this with no problems. Great power band very smooth for an SUV. Very capable off road, but still refined enough that you wont look dumb at nice events either. When you step on the gas it's very quiet inside but it sounds very nice outside. Most people think of the Blazer as a slow rig, I can tell you it's not!
4.3 liter vortec engine, super reliable, powerful.
It would be nice if it was easier to work on. It's kind of hard to do routine maintenance on.