Bought these to use in place of my usual (heavy) safety boots as I often end up on my feet for over 12 hours and heavy boots were a killer on the legs. They're really comfy, offer great support and most of all are really light in comparison to other saftey boots I've had. Quality seems really good although not had them long enough to make any judgments about how long they'll last for, I expect them to last for some time though, certainly not dissapointed.
Feet can get a bit hot (read sweaty) if you're wearing them for extended periods, but then I guess that's going to be the same with any full leather boot.
I'd buy them again, so I guess that says it all.