
I've used one of the MasterPlus Pro spray collars. I wouldn't recommend it. It was only effective on my dobe - no effect on my rott X whatsoever - and the effect on his behaviour only lasted so long as he had the collar on. Even though I spent more than double the recommended time getting him used to the collar without using it, and put it on long, long before a walk so he wouldn't associate the spray with the collar, he still made the connection.
His recall did become very good with it on - but it wasn't a permanent change. He soon slipped back into old ways once the battery died, so I had to start training without it anyway.
As it is, I've now acheived the same results for his recall without the collar as I did using it - and he's almost leaving dead rabbits on command now too. The problem with RC collars is not only the dog connecting the spray with the collar, but also timing - it has to be spot on, and the delay between pressing the button and the spray (which increases with distance) can cause problems in training, setting it back instead of making progress.
My college tutor has used one of the ultrasonic anti-bark collars - and said it was absolutely useless, not once did the dog wearing it set it off, but when it was left on a kitchen worktop, a door set it off!