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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.
hippy-
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.
jackbepablo
Do you find it is actually pretty practical and not just a silly weight weenie thing? I'd eyed those up, and found the OMM Raid PA which is half the price but probably many magnitudes worse, but as it's pretty niche theres not much out there.
Someone I know is working on an upcycling program and Ive suggested making half quilts from old fucked up down jackets, but I don't think we'll see one come into existence very soon