I tried it a little while back. It terms of strenthg gains, I saw only my endurance improve (not really my maximal strength). But, regarding size and definition, I'd say it was a success (for the few weeks I could stand it). I noticed significant increases in vascularity and overall definition, however this could be correlated to the fat loss I experienced.
All in all, I didn't like Meltdown that much for fat loss, strength, or size as compared to CW's HFT, which allowed me to lose noticeable amounts of fat, add 10 to 30 lbs to ALL of my lifts, and gain a good amount of muscle while adding 5 lean pounds.
Plus, Meltdown is a f*$#ing pain in the butt when your used to lifting in the <13 rep range with any kind of rest periods.