I recently made the switch from normal hand sanding and pole sanding for drywall repairs, drywall additions, wall prep and trim to Festool. It is a 99% dustless sanding system that when used with an extractor is very efficient. Saving on clean up and prep. I highly recommend this system and look forward to discussing them further with anyone that cares to.
So far to date the sanders getting the most use from me are the ETS 125 and the RTS 400. The RTS allows me to get into the corners that the round pad on the ETS can not get to.