Ok, I just bought a used vert. 2-12 from my other guitarist in my band. It has the mc90s in it. I've played 2 gigs with it and haven't been able to get a decent sound that I liked. It sounds like the tone is lost somewhere in the cab and I can't get it to come out, if that makes any sense. Its a decent sound but it doesn't POP out like it should. So I slapped one of my WELL worn v30s outta my 94 Tremoverb combo in to the top spot in the vert 2x12 and bingo,out pops some upper mids that were missing! The cab came to life! I'm still not sure I'm gonna keep the other c90 or not. I have some Eminence Private Jacks that I love in a 4x12 and maybe ill gig on the current set up and then switch out the c90 for the private jack and see where that sits with me. Just thought id post my experience with the speakers I have and hopefully it helps, especially because its coming from the opposite end (c90 to v30). Btw I'm not playing metal with this rig (mk V into vert 2x12) I use my tremoverb thru my 4x12 with 2 private jacks and 2 g75t celestions in an x pattern and it rules for newer hard rock/ metal!