I've got one. But I use a sort piece of hose for WC and f+e cisterns as it's a pain to lug it in and out. I did use it the other day because a pristine carpet and annoying customer meant I needed every single drop out of the cistern before removing it.
There seem to be two version of this. Ones that are around a tenner and have bad reviews and ones that are around £20 (with a clip on the side to hold the hose) and have good reviews (probably the original.)
Just like the fact I reckon I could tie it to the side of my tool backpack.
But yes, I'm sure it'll end up not being used. But it is christmas!