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There is a tendency to sweep your own body with the muzzle as you draw from an SOB holster too. You have to train yourself to pull it out, point it down, bring it around and up. This can be learned with practice, but it does take a little more dedication to drawing practice than some other means of carry.
I'm sure there are lots of gunfights where holes are blasted into the floor at the shooter's feet because human nature is to start pulling the trigger as soon as you clear leather. If you start shooting while drawing from an SOB, you stand a very good chance of shooting yourself.

I'm not telling anyone not to get one. Mas Ayoob is a big fan of them and I'm a big fan of his. I'm just saying you need to be aware of the disadvantages (of any mode of carry) and train to overcome them.