I may have entered this thread a bit late
but for what it's worth
.
RAB have an excellent and well earned reputation. One of my mates uses their 'topbag' for ultra light trekking and Mountain Marathons.
However, I am currently preparing for a 1 month long trek in the high Himalayas in February when it's quite likely going to be a tad on the chilly side (-25°C excluding wind-chill !).
Another friend of mine did a similar trek last year and has used RAB equipment before, but he has also sworn by bags and down jackets by a company called PHD or Peter Hutchinson Designs.
For my Trek to Nepal in Februaray I've picked a Diamir 900 down Bag
http://www.phdesigns.co.uk/product_info.php?cPath=26_62&products_id=96
I know many here really rate the Nanok bags but as far as I am aware (and I've done a search) no one has ever discussed,reviewed or rated PHD kit here on BushcraftUK.
PHD has a web site at
http://www.phdesigns.co.uk
I'm buying most of my kit for this trek from Tower Ridge
http://www.towerridge.co.uk/ they stock RAB and PHD kit. They have been extremely helpful and seem to sell it cheaper than any where else online though they seem comparable to the outdoorshop.com.
The trek in Nepal is not really Bushcraft related (unless the hunt for Dhal Bhat and a Yak Steak count), but I will do a review of the kit I take just so that there is a wider selection of reviews on here.
PW
The Usual Disclaimer applies I don't work for any of these companies blah blah blah Brrrrrrrrrrr I can't believe I really doing this !