I use them on a rayco 1635 super jr. They are very good on my machine, i get better performance from them than the standard rayco teeth. I did have to space out the straight teeth from the cutter wheel so I could change the teeth without having to undo the carriers.
I've used the Yellow Jacket System on my Vermeer 252 for about 6 months now. They are a good system the stand out for me is the double sided tooth and the speed at which the cutters can be changed.
I have not had any problems with the system so far you just have to make sure the nuts are tight before cutting but thats a given with any system. They seem to hold the cutting edge a little bit longer than other systems i have used on this machine.