In reply to bouldery bits:
> I like my Rab sleeping bag (few years old) but will avoid further purchases if that's the sort of expectation they have of their own kit's performance.
One other thing to look at if you're considering rab down filled products is the down:feather ratio they are using.
If you look through their website you'll be hard pressed to find any info about this. I'm pretty sure the reason for this is that they changed this a while back, increase the feather content.
Edit, for some reason they have multiple websites, the One starting equipuk.com has more information about down feather ratios showing that indeed they now use 90:10 for the cheaper end (still talking £400 neutrino range bags) rather than 95:5 as they used to. The rab.equipment.com site ignores all the technicalities.
Post edited at 22:57