just used their rapid flex with green on the bag. nice gear to use with decent pot life. got it from creative kitchens in garforth. a plumber i work with uses benfer tanking on every job.
ive used quite a bit of it for fixing porcelain to walls and im using the rapido flex in morning i think it is good gear for price i getting it from a place local to me called STS (Specialist Tiling Supplies)
From the replies here i think ill carry on using it.