I've been curious about the Barber Trifecta because it's a clone of the Tonebender as well as two other fuzzes if it can comp the tone in a smaller and more convenient package as well as have more versitility then it might be worth picking up.
As I said in a short review I did a while back, what makes the Trifecta work for me is not really the mode switch, which is very subtle, but the EQ possibilities. The "tone" and "sludge" controls are basically "treble" and "bass" controls, plus you can pull out the tone knob for flat mids. So basically you can have a bass-heavy sound but dial in some biting highs too... way better system than, say, the single tone knob on a Big Muff.