I use one in combination with my stock OTS. I like it, it has a nice reverb on tap only mine has a constant hiss when used as an overall master volume (i.e. when you pull out both the send and return knobs). I've heard it has something to do with the decay, each one of the second version seems to have this problem... I should get this fixed. Other than that it's a fine unit. It's about the size of two linked MXR small boxes. I wonder how it compares to the Dumblelator?
It is a dumbleator. plus parallel mode, plus reverb !!!
If you open it and separate wires from each other, also remove them far from the unit walls buzzing will stop (hopefully).
Cheers