I have a Nimbus and I think it is a top of the line pack to carry. It can be a little confusing as it has a lot of adjustments, but once you get it set up right I am not sure you will find another pack that carries as well.

It is not as wide as the Superior from Granite Gear but carries noticably better and the Superior is a nice pack too.

I also have a CCS Guide that i am very impressed with. I would assume the Pioneer form CCS would be a very close second to the Nimbus for comfort and maybe be better as far as quality and durability.

T