^ seems like MR is losing some love on these threads last couple years. Even seems it's been bumped out of the perceived "Big 3" which I always thought was a joke anyway.
I've never touched a Stone Glacier pack. I've fiddled around with Exo packs and can't imagine I'd take one before a MR Marshall or most bags that fit a Kifaru frame.
For the budget and some shopping, you could get just about anything for a great deal. Folks that really geek out on packs are always buying and selling.