hi all, only been plastering a couple of years now and this is my first comment. Been using MT SS, but after all the chat about s.flex trowels I thought I'd try the Nela. Myself and the much more experienced guy I work with (he uses Ox) both found that although it feels good and leaves a smooth finish with less effort....it still leaves hollows. The SS is rigid enough to fill these however the S.flex seems to just glide over so I've only been using it on final pass