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I'm certainly not doing anything as extreme as you tend to go in for, N/S Downs Escapade is my dry run of kit before AMR. In theory those shouldn't be Alps cold, but I don't know if I'll manage either if I fail to sleep. I did a test overnighter recently and my down bag entirely filled my seatpack which is far from ideal. Losing the tent for a bivvy will give me back most of a fork leg, and then even if jacket and quilt/half bag is the same pack size as a full bag it can be split across luggage and saves me a jacket shrugs I have no idea what I'm doing, this may go badly.
At least my test set up the other week rode really well.
I wouldn't pay £300 for one now but I didn't mind using the PHD one. It's long enough so I don't recall any air gap. It smaller so better for my road bike where space is limited (especially as I was already carrying down jacket). I sleep cold or at least, since I only ever take a bivvy I sleep cold but going into the mountains and/or racing earlier in the year I wanted warmer/better sleep so it worked for that. I do wish I'd kept my full PHD bag though since now I want to do more touring stuff with the missus and now I won't pay the premium for PHD bags.