This is my opinion, but I do LIKE this split IN THEORY....but in reality, I just won't work. How are you going to train back super hard and then come back the next day and do legs? Unless you are on gear, I don't think you can recover quickly enough. I follow a similar split, but each week I usually end up doing 2 back days and 1 leg day (if I deadlift, no way I can squat the next day) and vice versa the following week (2 leg day, 1 back day)