Its ridiculous for strength bro. I used it a while back while bulking. It blows var out of the water in terms of strength gains. Never tried d-bol, but I hear the strength gains with Beast are comparable to it but with little to no bloat
the lethargy for me is definitely a factor, its not a huge problem though, i wont be buying anything to boost my motivation or anything if i do beast again.... once you start your work out or get up to work or w/e you soon forget about the lethargy effects, its just that first bit of motivation thats the annoying part..
i have lethargy on and off, not sure what actually makes it happen.. loving the beast though to be honest, def going to be using it again down the track.