I couldn't resist. The expectations and conventions of being a studio rat guitar player required I order one of these to go with the Mark VII. Mesa will match the smoother black taurus vinyl and tan corners of my amp, but won't do a matching wicker grille. I don't mind at all. It'll sound great and make mic placement that much simpler since I'll clearly see the speaker cone.
I've always thought the C90s sound clear and open, with a solid amount of upper midrange and HF detail, not too thick in the lower mids. So they're among my favorites, especially relatively clean (I always have a little grit going, however). I see here they're a little controversial, but that's usually a style-of-play choice, as opposed to a speaker being somehow better or worse than a different one.
I've been using my Lone Star 212 combo with the C90s with the Mark VII, and it's a great speaker for the amp, given what I play (mostly 'edge of clean-to-breakup').