Mine would slip a bit with the rubber band thingy installed. I had another wider band that came with a Cramp Buster that I had previously bought. I slipped the second wider band over the one that came with the Go Cruise and it works like a champ. Rather than use it as a "cruise control", I use mine to get a minute or two relief from "numb hand".
As far as breaking, I refrain to taking mine off and will see how long it lasts. If you notice in the instruction, they're pretty clear about where, and where not, to grip it when removing it.