Korg Pitchblack definitly, better than the Boss and not unnessecary huge like the DT-10
You're right tomjackson, in that it is an actuator switching a microswitch, but;
The Pitchblack is true bypass, the microswitch switches a relais that switches the pedal true bypass, just as good as mechanical TB. ;) But cheaper to make I guess.
edit: By the way, the + isn't more accurate in (half) strobe mode, only in standard mode.