Only a few using them ,come on guys get with the times move on ,i could have laid a 15 mtr floor the time that fella explaind all that been payed gone home and had my tea,but he had to explain properly for all us that dont know anything,listen i dont come on here to fall out with folk and i think after 40 odd years in the trade i think i may know a little and a little respect wouldnt go a miss,that american fella is probrably a very rich man now and doesnt need to fix another tile theese new fangle bits cant work miracles,maybe the tile maufaturers need to spend and make the tiles flat that woul be nice for us and the customers