I have the Rush-24 version and am pleased with it so far, although I haven’t used it for much yet other than a few short (and very un-rugged) trips. I’m a sucker for lots of pockets and this didn’t disappoint. I haven’t felt the need for anything bigger - often the 24 feels too big for my needs - but that’s a very individual choice.
The bag feels very solid and well made, nicely designed, and it hadn’t occurred to me that it looks particularly military. Maybe that’s a difference between the US and UK (where I am) as there’s less “military”-looking stuff around to compare it to.