I did a recording session once where the bass player used one of the sansamp pedals (don't know the model) straight into the board and I thought it sounded great. I used the sansamp gt2 on a gig one time. It was ok, but I also didn't get much time to fiddle with it. I wasn't convinced that I needed to buy one but my sound didn't suck that night!
Never played the amps. I saw either a Tech 30 or Tech 60 in one of the studios at school once. I'll look for it and see if I can't use it next time I'm there. Glad you're happy with yours!