Also, just because you don't see them doesn't mean they aren't being used.
When I had my 5150, I hardly seen anyone using them and that amp never failed on me on stage. The same could be said about my Ampeg VL-1002.
Im in between boston and new york city, a good 4 out of 5 bands that tour thru here have mesa or a 5150. I know theyre being used, didnt say they werent. I said it seems professional musicians or touring musicians use RELIABLE amps. The DSL must not fit the bill since all over the net are complaints about them.