Wife has a Metcalf 50. It's a cool rig. I just traded a MR 3DAP to a friend for an early Marshall (pre "MT" Guidelight) and gave my 6500 bag to another friend who has a NICE frame.
If it fits your capacity needs, the Metcalf is nimble. I admit, I'm a gear whore, and my kids (college sophomore daughter, HS Freshman Life Scout son) are well set. I bought my first Kifaru about 13 years ago, MR designs are great, HPG too.
Metcalf 50 is a pretty sweet not too big pack that with the meat shelf can carry Marshall/6500 sized loads. I've grown past that (mostly), but, options are good...
