I'm sure you'll get several opinions on this. At around 75-80hp these turds become hard or impossible to shift under a load. Like when you're drag racing. The override makes it so you can shift under a load and without the clutch. A nice one soumds like it's belt drive goin down the track. Can't even hardly hear the shifts. The lockup, or lockout as some people call them(not sure why), locks the clutch and keeps it from slipping under high hp applications. The two pieces kinda work good together. Once you get a decent hp motor that's hard to shift anyway, then lockup the clutch at high rpm. You're kinds screwed. So put an override in and you get to shift wide open with the clutch locked up. Makes u faster too. Lockups are centrifugal too. Faster it spins, harder it presses on the clutches.