I played some gigs out of town this weekend and borrowed rigs from other bands. one was a Pignose 100 watt all-tube amp with 2x15 (the same speaker configuration I use). I was skeptical because I had only heard of Pignose through their little toy amps and because my previous tube amp experiences were bad - I always found them woofy and not crisp enough. But this thing sounded FANTASTIC. Very punchy, and the natural overdriven edge was new to me. I sounded like Entwistle on Live at Leeds! I was in Manhattan the next day and randomly wandered into a guitar shop, and they had the same head for $450 used. Then I discovered that this price is not out of the ordinary. So what's the catch? Are these reliable?