ok, i tried out 3 overdrives today: the bb preamp and the tonebone classic, and the tonebone plexi. the bb preamp will color your tone allot but it is great. it gives a bit of a nice mid boost without being too colored like a TS. there is also allot of bass response. this pedal does not have very much gain but does sound like a tube amp pushed into overdrive. this thing is one hell of a booster too.
the tonebone classic was utterly amazing. it sounded great, and authentic, and dynamic with the drive on one, set to low with the switch, and with no mid boost. then at full gain, with a 12 db mid boost, this thing was singing, sustaining incredibly long yet giving authentic tone. this will give quite a boost, but not as much as the bb preamp. this pedal will color your tone quite a bit and lacks low end very slightly. the most transparent setting was with all mid boost and the treble shaper off, and the filter all the way up(no filter), treble at noon, bass full. then there was no lack of low end. you know that feeling you get when you find a great tone? this was it.
The plexi sucked. i found about two usable sounds out of it. it colors your tone in a crappy way, the mid scoop isnt really scooped at all, and its bassy. with the drive all the way down on the rythm channel, and all the tone controlls at 12, or no flat w/switches it wasnt bad. also on the lead with the mids boosted to oblivion gave a nice lead, but... ####ty pedal. the tube is just a gimmick in this pedal.