Hi
Biggest pile of pants I have ever used, do not touch with a barge pole.
The only people who say they are any good are those who have parted with cash for them (wouldn't admit to making a mistake now would they!)
I trialed one on a big job and it was an absolute nightmare, only collects half of the gum it removes and emptying it is a pain.
Only works with hot water (I use the term 'works' lightly).
Why do you think the person is selling it so cheap... no-one wants it!
Best using a normal lance on low pressure with temperature turned right up.
Andy