I used it quite a lot when it came out first time.
Found it to be quite good on most backgrounds.
Perfect for Artex
Good for paint Matt or silk.
Didn't like it on high suction as still felt like I needed to at least wet back ground which defeated its purpose!
Just thought it wasn't cost effective enough for me to warrant using it all the time.
Ok it saved a little mess with Pva but I can put that on the walls near enough to not make enough mess that it needs cleaning up.
If it was the same price as multi then I'd happily use it, otherwise those extra pounds will go towards to early retirement.