Dual Mode RO series sanders come in 3 different sizes, I have the RO150 &125, the ETS 150/3 a random orbit finishing sander, the RAS 115 which is more like a grinder, and the half sheet RS 2E. I have used all but the RAS on wall board. All are corded. My thoughts about corded: as long as you have the vac tube attached, the cord is no issue (tied together with Velcro strips), and since I have a respiratory problem, I generally DO NOT sand without dust extraction. As an aside virtually every other power tool in my shop is Festool - all connected to a CT26 - chop saw, track saw, routers, jig saw, planer, domino. Exceptions: lathes, band saws, and the like.