There are no complaints on my end. I took delivery of mine in April '06, just after it was built. It's in the 82,000 serial # range. I wanted to be sure that any bugs and recalls if any were worked out since the May '05 debut. I made a mistake, 282,000. This serial # is odd though, because I understand that about 84,000 H3's were built for 2006? Maybe the # goes by the Chasis, not the name? Colorado, Cheyane, H3???

I also drove the '07 yesterday, and didn't notice a real difference in the new Vortec 3700 motor. The interior was exactly the same as mine as well as the body accents like the GM logo plate.

I think for me, it was a wise choice to wait till the end of the '06 model year. I think it is closer to the '07 than the '06.
But I have the smaller motor.