I just finished a Bluesmaster kit from Nik.

To answer a post from above, yes it is a bit rawer sounding than an ODS. (I know an industry rep that has 3 real Dumbles) I removed the teble cap across the OD level control on mine to tame a bit of high end harshness.

I'll need to gig with it to make a real critical analysis of how it sounds, but so far so good. Mine is the 100 watter, to the half power switch is a must for small venues. Maybe I'll try the 6V6 option mentioned here.