yes, be prepared for trouble. I use radiator hose to the reel and the normal hoselock connectors - the posh ones, yellow with a bit of metal in them and Gardiners elbow.
The biggest problem is trying to get your pressure setting right when the hot water starts pumping - too much and you'll possibly blow the connectors and crush the reel. Too little and the pump stops when using cold. I changed my controller and reel. Had no problems for ages now (touch wood). No trouble with connectors either.
Originally I had so much pressure I had leaks everywhere - even the heater would blow water out of its pressure relief valve underneath. I had the water so hot that it blew the pole hose when I trod on it.