I've gone one and I think it's a great piece of kit! The 'waterproof' part on the bottom isn't something I would trust with my life so to say, but in my limited use of it, it's stopped any minor damp rising into the sleeping space.
The bag is pretty roomy, plenty to fit a fairly heavy duty sleeping bag into, there's a draw string across the shoulder area that is nice for extra snugness.
The only thing to get used to is the flap at the head of the bag that is used for wrapping up a pillow...it's actually useful if you don't travel with a pillow, you can just roll up your jumper etc and it will keep it in place, I just had to get used to not sitting up too quickly it's all one piece with your pillow if that makes sense....
Anyway, it's a great addition to the list, it's very light weight on it's own and makes a great bedroll.
Hope that helps, I got mine for alot more and am very jealous you can grab it for that much over there...
GB