It works. maybe not at that amount of volume but it works. At the moment I'm travelling a lot because of seminars and I'm training everything everyday to some extent. I normally do one heavy lift for the workout and then do one superset of 2 exercises for:
And I normally do each superset for 3 sets
And once in a while I throw in arms in the mix
It works well. I find it less taxing than a workout where I brutalize one lift or one or two body parts and it does seem to work at improving muscle mass. But more importantly my overall muscle tone is better I'm never flat.
I'm not saying that it's more effective than more traditional programs. But it does work if you don't overdo it.