ok, in my BJJ understanding, wrist locks are not common (at least aikido style or chin na style). However, I just got a dvd set with Rodrigo Mederios and he shows a few and another set showed 2 or 3 of them (Rinaldo Santos?). If I remember right, didn't Garcia beat Pe De Pano using one? Are they uncommon but still an integrel part of your game? Who here uses them with success?
My favorite submission is to get someone's back then transition to a reverse triangle and finish the wrist. If I catch a guy sleeping I'll do it from top mount and I'm constantly looking for new situations to get them at but one's where I have control, not where I have to snap it quick to get the finish.
I've got a lot of "functional" wrist lock experience from my pre-BJJ grappling days. I can can them most of the time against white belts whenever I want to, and I'd estimate I get them about 30-40% of the time against blue belts, even when they know I'm going for them.
I use them a lot as a high-percentage submission that also helps set up a lot of other transitions and/or submissions. DEFINITELY an integral part of my game.
Check out the sparring footage on Roy Harris' "BJJ Over 40". It's a great set, even if you're way under forty. ;) He does an insane amount of wristlocks in that footage.
I have some 6 years of Aikido under my belt (lol) and I think I've done some wristlocks... BUT only the one type "gooseneck" ones - the other's I've occasionally used for fun OR successfully to create space but never to submit...