To be fair, the other guitarist in my band has the SpiderII halfstack, and at about half volume, the distortion sound is very good. A little trebly and thin, but a better than many amps selling for the same amount (for what we play anyways). Any less than half volume and it sounds like it's lacking too much. Any more than that and it turns to fizz
so it only sounds good in a very limited area of the knobs' settings, even perhaps only at one setting? Has he tried a krank, out of interest?
;)