I have not had any split under pressure, as they are double skinned, but you do need to regularly vent the pressure
My conditioning cabinet failed when I was away for 4 days recently and the tap blew out, where it got too hot and expanded however, dumping 4 gallons of Timothy Taylor all over the floor :sick:
I'm looking at alternatives to bottles (sorry for hi jacking the thread)
I know cornies are the way to go but can't afford them right now
I have several budget kegs but never get a good result with them so may try these polypins or the small kegs you can get as I have a despenser for them