Basically, title says it all. Opinions.
One thing is that I don't actually need 4 channels. The other is that the volume difference between 1+2 and 3+4 kind of anoys the hell out of me.
However, it sounds great, and the rectifier channels are pretty damn awesome.
I haven't ever liked a single Diezel I've ever played, and the only recorded Diezel I liked was Adam Jones' VH4 with Tool (even then, it's blended with a JCM800). I'd say don't make the trade.