I love Mono cases. I definitely liked my old Gators as they are great bang-for-buck protection, but Mono is top shelf protection and utility (no experience with
Reunion Blues but they get the same kudos, as these two makers seem to be the go-to gig bags at this markedly higher price tier).
Paul is right on about Mono quality. That said, if even considering a Mono I would personally look into the M80 over the Vertigo for an
acoustic. The vertigo is
awesome for electrics IME, and the "boot" really offers superb protection at the bottom, but this is more a benefit to electrics as they are heavier; with a much lighter acoustic guit, I think the boot's benefits are likely moot. Personally, I wouldn't want to be sliding my acoustic in/out of a Vertigo's opening which
seems like an invitation to surface abrasions. Not wholly convinced about this, mind you, but given how my electrics slide in/out of a Vertigo, I'd
not want to do the same with an acoustic, let alone a larger body like a GO. The M80 unzips and opens conventionally which, in my opinion, is "safer" for an acoustic guitar's finish. And yes, I absolutely love my M80 for my acoustic use. Both are clearly Mono quality, and this all IMO anyway.

Edward