My first pair of these I had two issues after a short time of wearing them.  The plastic eyelet pulled out of the boot and the rubber outsole started pulling away from the suede on the side right above the Rocky name.  I contacted their customer service and sent them pictures of the issues, and they sent me a new pair without asking any other questions.  I'm not sure if that is their normal procedure, but I was deployed at the time and told them that I did not want to be without my C4 Trainers for several weeks since there is no comparison between these and other boots.

The second pair held up for over a year in the deployed environment without any issues.

These boots are lighter than my running shoes...think Nike Free Runners meet combat boots.  The first few times I wore these, I kept looking down to make sure I hadn't somehow put on my running shoes instead of my boots that morning.