I have owned the regular version for two years now. Mostly I like it a lot. On the plus side, very, very lightweight. Ergonomically, I'd give it a "B". A few negatives, tho. First, what the hell is with using plastic on the buckle latches? Yes, plastic. Like a Petzl Ball lock gate. Petzl's response to this (at the St. Louis ITCC): "Well if one ever breaks, we'll replace it free of charge for life". My response: "Who's life?" I know one climber who has had one of them break.
And these spring loaded releases sometimes get debris behind them which keeps them from opening. Even when this doesn't happen the buckles are very difficult to open and unlatch. This can be a good thing, but also a frustrating pain after a long hot day.
I agree with others who said this is really not a removal saddle. The weight of a chain saw, even a one-hand - OOPS!- top handled one makes this saddle much less comfortable. I've noticed it also makes the waist band loosen. NOT GOOD.
Finally, be aware that the ring screws require Loktite. When I first got mine and read this in the manual, I asked Sherrill Supply if they already came that way. They didn't know, and wouldn't give me Petzl's phone number! I found it myself and called Petzl. Their answer was - get this - some of the first ones had it, and some didn't, and they didn't know which were which. My advice, if you buy one, remove the screws and replace with Loktite (not the permanent kind).