Wrong on the locker...
It is either fully locked or fully UNlocked. It essentially acts like a spool or an open rear, depending on if you're under throttle or not (the throttle is like the on/off switch for a locker).
Turning is no big deal with a locker... Didn't even notice I had a locker most of the time, occasionally with a slow (like parking), sharp, under throttle turn you'd hear a bang but for the most part it is no big deal.
IMO, and this applies only to 9" Fords, I'd never consider any other differential than the Detroit Locker. Opens just flat suck, I have a pile of them in the basement, just put one in my Mustang to get it ready to sell (no WAY someone's gettin' my 3.89 locker unless they pry it from my lifeless arms), and I've fried too many clutch LSD's to have a good opinion of them, they're just Mickey Mouse in comparison.