i have something close to it ... works well for me and the safety is nice.. also prevents you form burning down your house if you forget to turn the gas off or something explodes... i dont walk away from my batch during boiling so once i see the little light flashing i just push the button...
X2 on that... the trick is keep the labels wet until removal and only pull out a few at a time the labels dry up quickly and will make removal harder.
Newcastle, Sam Adams, Gordon Beirsch, and Red nectar are all pretty easy to remove.