I've used this, so far, for a week's trad climbing in warm (85-95 degrees), humid conditions. It was great. It's the most comfortable helmet in which I've climbed (I've also used BD's Vapor and Petzl's Sirocco, both of which I liked, but not as much as the Stealth, and several plastic helmets). The harness is easy to adjust and it wasn't hard to get a good fit. It doesn't feel appreciably heavier than the Sirocco. It also had great coverage. I took a pretty serious fall and the only noticeable thing was a 2mm dent in the foam at the very bottom of the back of the helmet. The plastic was barely scratched. I suspect in a helmet with less coverage it would've been the base of my skull with the dent. I have the helmet in yellow, which is very reflective.
I don't know how the helmet will work for cold weather climbing or skiing, but it will be my primary for those purposes come winter. I suspect the helmet's harness will be manageable with glove liners on, and maybe with climbing gloves. The helmet comes with removable pads (and a spare set to customize the fit), so I anticipate getting a good fit over a beanie. It'd have to be a pretty good helmet for me to consider anything but this in the future.