For the 2+lb weight this bivy weighs and for the same price you could get the Big Agnes Copper Spur UL1 Tent. A bivy should be lighter than a tent not the same weight. I will give them props for using a great material (eVent) and have no doubt this shelter will protect you from the elements well and it has a low profile for good high wind performance.
I have not seen a sale yet for the Permafrost. Best bet will be to wait for a 20% coupon
The description is confusing. it says "Sewn-through, baffled construction". So which is it Sewn through or baffled?
The purpose of this jacket is to provide mid layer warmth under a shell in Winter or in my case to provide highly breathable outerwear in the summer evenings in the Alpine. I traded in my Nano Puff for the R2 because frankly the Nano Puff doesn't breath and I would quickly get sweaty/clammy if I was in cool temps (i.e., 50's to low 60's). The R2 is more versatile. In cool temps I can have it as an outer layer, knowing that any significant heat build up will easily escape before I sweat, in colder weather I can throw on a wind shirt/shell over it to block any wind.
Wish there were more pictures. It's very unclear what venting options you have on this Bivy. From the looks of it, it is just designed to suffocate you.
I bought this on SC last year when it was on sale at 50% off. I wouldn't buy unless it was on sale. It's just a fleece, no superior fabric or anything. It's got Arcteryx brand and has a nice cut but honestly it's a fleece jacket, nothing more nothing less.