How does this compare to the Rotex. Can it remove stock quickly or it it only a finish sander.

The ROTEX sanders feature a dual-mode capability. There's a random orbital mode just as you would find with most finish sanders. But, there's also an aggressive, eccentric gear-driven mode that gives you material removal similar to a grinder.The ETS EC sanders are brushless versions of the ETS sander. These are random orbital sanders and they do not have the same aggressive mode as the ROTEX. However, the brushless motors are more powerful than the brushed motor in the ETS 125/150. With the more powerful motor and a lower grit sandpaper, you can achieve faster material removal, but not on par with the ROTEX.The ETS EC sanders are, performance-wise, directly between the ETS and ROTEX.