I've just been converted.
It was odd,I was playing through a tech21vt into hartke lh500 into a ampeg 6x10. then got myself a freshly retubed and serviced svt cl.
First practice everything was noonish ( didn't have much time to fiddle)...... And I must say I was slightly disappointed in not getting the sound I imagined it would have!
Read up a bit and was recommended to forget about the low/high boost buttons drop the bass to a quarter, trebble just past noon and mid 3quarters.... With the selector at 2.......tried it at the next practice... Pure beautiful sound :-) I play in a queens of the stone age esq band ( cgcf) and it cuts like a bitch