It's also hard as hell to build. I've never had harder, more draining workouts than doing 7-8 total sets, with 3x5 at 5RM. The third set of squats, powercleans, and deadlifts are especially brutal.
30 minutes in, I'm drenched and can barely see straight. And I thought I had worked out "hard" for the past 15 years. This shit works, but it is hard.