I have burned up Dewalts, Rigids, and Ryobis.
Fiberglass sanding is what tears up the bearings.
I went to a Rigid 18V because I have most of the other tools that take those or relatively inexpensive aftermarket batteries. With 2 big aftermarket batteries I can go all day as the one charges faster than I wear the other down.
The Rigid replacement hook pads are either expensive or hard to find...the good news is the Ryobis were inexpensive and fit.
I you buy Rigid from anyplace except Home Depot be careful as the warranty stuff could be void. If you buy from Amazon...I know it is...I believe it say so right in the ad.