Hi, I'm looking at the tc electronics bg250 combo amp and have heard good things about it. The first version of the 115 had a tube drive knob and a toneprint knob but the mk2 has dropped the tube drive for a second toneprint. Has anyone any good or bad experience with either amp? I've read that you can only use one toneprint at a time so i'm wondering whether to go for the mk1 with the tube drive while its still available. Any preferences?