I've had mine a little over a year now, best amp I've ever had........not that I've had any boo-teek amps before, but this is way better than any mainstream profit margin amp you find in the middle of the road retailers. The only thing I've had that comes anywhere near it was a red knob Twin.
I run Tung-Sol tubes in mine. I have experimented with speakers, and liked the Weber alnico's Michigan and Blue Pup, but as much as I hate to admit it this amp seems to do better with the seemingly more efficient ceramic speakers. I have a Ramrod in it right now, and it is nice, but I have not yet found a 10 incher that pleases me like the Delta Demon. I have a 2x10 with a G10 Vintage + Tone Tubby in it, and that is a nice fit. But the best by far I've ever had in my possession is the 15 inch alnico Blue Dog. WOW!!
I'm heavily into the pedal chain thing right now, so I run the clean channel most of the time, with increasingly nice results.