i can attest to it feeling underpowered, then again ive been using just a rotary, however after testing it and using it on different paint systems (test pannels scrap bumpers) it does work great. sure its slower then the rotary but really works great you need to learn the machine, keeping pad flat, dont use too much product, keep a clean pad.one thing that helps is try adjusting the pressure you are putting on the head of the machine,for me slight pressure didnt spin pad much, applied more pressure and pad started to spin.also depends on the surface your working on, if it has alot of curves the pad can stop spinning but you need to learn how to keep the pad spinning on stuff like that. just takes some manipulation of the way your holding the machine. just keep practicing and you will get the hang of it.its best to use 5.5" pads or smaller. luckily for me i catch on to stuff really fast.another thing that helps is not using the handle, i don't even use a handle on my rotary it just don't feel "natural" to use a handle. my PC7346's handle is going to be used on my 4" disc grinder as i broke the handle of it unless some one here wants it....