I have both the rotex 125 and the delta dts400. The delta is so easy to use for finishing details, conversely sometimes I find the rotex 125 a devil to handle sometimes having a mind of its own. I feel the balance of the tool is not quite there, and find that you get a better results holding it at the end of the shaft near the plug it cable and gently lifting it just slightly, as this seems to give me less "skipping" from it. It can get quite aggressive - so fast removal, but keep an eye on it and keep it moving. I also have the ETS/3 150, wow, this sander is so sweet, makes me wish I got the larger rotex so I could swap papers. Something to consider.