I have both a Rotex 150 and an ETS-150/3. As far as I'm concerned, these are "complimentary" tools. I only use the Rotex for heavier work where either the rotary mode or larger orbit is beneficial to a project. It's a two-hand tool and that's not practical for the majority of the sanding I do. The ETS 150/3 does 95% of the work in that respect. But I like both and am glad I have both available.