When I tried mine in the shop I started with channel 1 (thinking I'd work my way up to Ch.3) but instantly knew I was going to buy the amp regardless of what the other channels sounded like! Then after I bought it I ended up playing a lot with Channel 1 & 3 for ages because those fitted most with the right sound for the band I'd recently joined. I played Ch 2+ a bit too, but only 2- very occasionally. It took me ages until I had enough spare time to sit about tinkering with it for hours on a non-band related thing. Then I discovered the tonnes of fun I could have using ch. 2 minus mode using only my volume knob and a fuzz pedal for vintage and bluesy fun!
I've never even heard it with the diezel cab, so can only dream what it sounds like then!