Well I started spreading before all these monster trowels came on the market and I managed to get tenosinvitus (guess at the spelling), tennis elbow and a cold shoulder all by using an 11" trowel, so perhaps its something to consider when your buying a trowel. Having said that I use a 14" for putting on and an 11" one for trowelling up. I just find that I can get more pressure and a better finish with the 11".