Always depends on what your goals are. This is alot of volume, you aren't getting alot of pure strength work out of it; more endurance strength than anything else.
I was going through Pavel's Naked Warrior book today and he had some great drills in there; one arm pushups, one arms w/ legs elevated, one arm dive bombers, etc. You can make the exercises tougher by holding pistols at the low point for a count, or hold a weight while you are doing it. But like I said, depends what your goals are.