I've used a TU-2 for the last 7 years and it's been solid (knock on wood).
Had the OC-2, loved it.
Had an ODB-3, it was ok...more of a sizzling fuzzy thing than an overdrive.
Heard lots of great things about the Line Selector, Harmonist, CS-2 and the Delays.
I think Boss does a good job of...