Most people seem happy with their EcoDiesels on the facebook groups. Few stories of serious mechanical issues, but many more enjoying them than not.

Other than Emissions issues (DEF), mine has been great and fun to drive in the wife's Grand Cherokee. MPG has fallen off this winter with the heavier tires I put on it. Mostly city is 19mpg. (with my foot in it a lot!) Summer trip with the family we were right at 28mpg with four people and some luggage.

I like the Colorado and the small duramax, It would be a great replacement for my Honda car someday. I'm waiting to see what Chevy has in the half ton coming out soon.