DC and rest/pause are THE best bodybuilding routines for results imho.. 20lbs holy shit man! I've gained 20lbs in the past half a year or better..but it's not all solid mass for sure! 
Cheers mate, have u used DC in the past??
Yeh its pretty good. I mean im no monster (at the moment lol). But iv gone from like 2lbs under 13stone, to about 14stone 4 (that was what iweighed about 5 weeks ago, im in hte middle of a BLAST and hopefully am at least 2lbs heavier by now), in just over the year.
1st Blast i put 8lbs on.
next targets 15 stone by the end of the summer but im hoping to hit that well b4 that.
I think once im up around 15 1/2-16 stone, i might switch up to something like powerlifting/olympic lifting based program, but even then i might just stay with DC.
Im not saying its all ripped muscle lol, My abs arent as super ripped as b4, but ic an still see them. Im sitting down to what should be a carb cut-off meal. Im cheating a bit tonight, so im having chicken fajita (with sum tuna thrown in), more tuna on the side and 3 large chicken legs (in chinese sauce).hmmmmm heehee
davie