Same as Jonny and M&C.
I used to use the pole hose tap, held in my hand. Real easy, just looped the hose round and turned on and off with my thumb. But did find the looped hose a little annoying at times, catching on things.
After using the univalve for a few weeks I've found the absence of having to loop the hose and tap in hand very refreshing. Makes my working day a bit easier somehow. Can't really say why yet coz the tap wasn't a big disadvantage at all.
I think it's an excellent innovation. See what its longevity is like.