Heyyy... So I just ordered a Bigsby for My Telecaster . But then I started thinking... although i've played guitars with bigsbys, I've never owned a guitar with one. How well do they stay in tune? Is it worth investing in a locking nut?
'72 Telecaster Custom
Dean V-coustic
Ibanez ARZ307


Metal Muff
Dunlop Crybaby
Marshall Regenerator
Boss NS-2 Noise Suppressor
MXR Analog Delay

Peavey 1x12 Something..
It depends on your play style, if you're doing a lot of bombing with it then they'll tend to go out (but that's the same with any whammy/bigsby), but otherwise they're stable.
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The Band
If you want to do alot of bombing you don't buy a bigsby. They are more for sultle vibrato than anything else. but a locking nut a la floyd rose won't work. Grab some planet waves locking tuners. I have some on my strat, and it holds its tuning amazingly well.