Based on his review, seems like this jacket is truly a "Quiver of One" jacket, and it'd better be, given it's high price tag, as he mentions a few times throughout his review:
"The Alpha IS is equally adept as a belay parka, an approach piece or a climbing layer. It really is all that and then some, and the more I wear it the more useful it turns out to be. "
"The versatility is rather baffling."
"It truly is a climbing shell and belay jacket and a half-dozen other layers all combined into one. Highly recommended, but it does cost over a thousand dollars, and I still haven’t quite made my peace with that. "
As tempting an all-in-one piece this jacket is reviewed to be, and despite some past season sales online, the cost is too much for my pocket and I'm happy with my cheaper Patagonia and TNF layering system for climbing, but some of you may find this review useful for your climbing needs or looking to replace your old and tattered multi-layering system.