I have used them , and they are a pain in the ass,

the speed in which you disconnected from your pole is impaired... it gets in the way.
mine went in the bin as it was constantly in my way when i disconnected the pole hose from the reel hose,
thats not to say it does not protect the fittings... it does... but i can work without it quite easily.
in fact i dont need it , no... i dont see the benefits as i dont rag my gear around
