In reply to Owen W-G:
Honestly, I didn't like MW Everest. It is way too heavy as a down sleeping bag and the Mountain Hardwear Lamina 0 has even better temperature ratings and is lighter! Also, the prices are rather similar and would outperform in damp conditions. You probably know that the down is good as long as it is dry - otherwise, it looses its loft and almost all thermal insulation.
Mountain Hardwear Everest bag also has 20% feathers in it (which do not give much thermal insulation - other makers use to make 90/10 or even 96/4 fills). Also, the fill weight is only 475, which would mean that the bag wouldn't be that fluffy (fill power explained:
http://en.wikipedia.org/wiki/Fill_power ). It looks like there is no difference between grey and white goose down, though.
I am not saying that the Everest bag by Mountain Warehouse is not good, but there are better options in the market. Again, if you are weight conscious and under tight budget, take a look at eBay, there are few good deals every week.
Post edited at 22:00