I've never gotten on with the V30 speaker from Celestion. I don't think it's terrible, but just not for me. I've had one kicking around that came out of my iso cab, and out of necessity, I popped it into a cab for use with my Dave Smith Mopho ... and it sounds great! Fat analog synth tones are very rich, warm, and euphonic, just like you'd want them to be. I'm running from the Mopho into a Behringher 500w power amplifier and then into the cab. Gets LOUD and sounds GREAT!
