I realize this question is very much in the weeds, but i plan on selling my ETS 150/5 and going with the new ETS EC 150. I want the newer design mostly for the height difference, but being new and upgraded arent bad reasons either. Is there an appreciable finish surface difference between the 150/5 versus the 150/3? I know it technically should be a more refined scratch pattern, but can the human eye discern the difference between a surface sanded to 320 with the 150/5 versus the 150/3? Does the 150/5 sand that much faster than the 150/3? My knee jerk reaction is to just buy the 150/5, but i also have the older generation rotex 150 that i didnt have before getting the original ETS 150/5. Also, unless i am incorrect, the ETS EC is a much more powerful sander than the older ETS. Would love to hear from folks with either and if they regret not going with the other.