I have one. Only used it on a couple of later season hunts, so my sample size is reasonably small, so take my comments for what they are..... It works well and keeps you warm. The biggest thing to get used to is having your arms contained within the suit. I found that I move my hands/arms quite a bit while on stand (maybe that was a good realization?!). Works very much like a heater body suit - just less bulk, maybe blocks the wind a little bit better - with a tradeoff that it is not as quiet, and has zippers on each side for arm holes, which the HBS does not have. They are similar in warmth. I practiced shooting my bow with my arms sticking out of the arm holes and it worked fine (I didn't have to drop the entire suit off my shoulders to be able to shoot.) I found that the layering underneath the suit was very similar to what I would wear underneath my heavier bibs and parka set or coveralls.