Depends a lot on the amp... I played mine through an Uberschall TJ and a Blue. The X pattern was explicitly designed as the "UberKab" for the Uberschall - at least to the best of my knowledge. It sounded great. I did hook up my VH4 (at the time) to it, and it sucked compared to the Diezel RL 4x12 loaded with
G12H30 70th Anniversary drivers in it. Completely night and day. Overall, V30's are not my favorite speakers - not by a long shot. But what I've come to realize with them is that they do have their applications. I'm in line for a new Mak 4 preamp. These are considered ultra tight as it is. Since they have both the Dorado and the Makoplex channel on them, each preferring different power tubes to really shine - I was stuck. The EL34 powered amps won't help the Dorado side, and the the other poweramps are mostly 6L6 which won't help the Makoplex side. I went with a Fryette 2:90:2 driven by - even tighter and more surgical - KT88's. SO much headroom it's ridiculous.
Why am I talking about this? Well, I'm going to use a cab that's either loaded with or has an X pattern of V30's in it to compensate for the tight & dry tones of the Mak 4. Since the poweramp can't do both, I'll get a clean and clear power amp, and hope that the V30's give it more mid grit chewiness, and therefore, more musicality. If the amp was loaded with gobs of juiciness - I'd probably opt out of V30's, or, conversely, if the amp was compressed and thick, I'd stay away too.
Long story short, the X pattern has its place, but I'd never commit to one without trying it with my amp of preference first. In the above example, the Mak 4, there's a good chance I'm going with a 2x12 loaded with G12K100's and a 4x12 loaded with V30's - the 2x12 will be the lower cab, and will cover the high depth, high bass from the power amp - the top 4x12 will cover the mids and up. And with the V30's in there, either exclusively or X'd with something also strong and rich, I should be able to get the best out of this otherwise "tight and dry" preamp and poweramp combination.
V.