I had an opportunity to use a Gadget this last Sunday for a few shots left handed. It was set on "zero" and I was able to get a little better reaction than without. Maybe 4 boards of hook but more impressive for me was the added speed that moved the breakpoint down the lane further. I have seen a similar result right handed with more speed but not necessarily more hook. I will sometimes use a Robbys support with no metal at all during warmups to avoid overstressing the tendons. Once loosened up the training aid goes back in the bag.
If you "need" a wrist support to bowl effectively it is probably a sign that there is a grip problem, release problem, over training or the most overlooked culprit - insufficient recovery time.