I used a Dynabrade sander a lot. I have also used electric random orbital sander a lot. The Dynabrade required 15 cfm. The 5 hp 3 phase compressor would heat up, because it only would put out 17 cfm, and any other use in the shop would be more than the compressor could handle. The maintenance of a compressor to run a sander was not worth it.
More important, my Dewalt 5" random orbital sander has better dust collection when hooked to a central vac. I have a central vac in the shop, meaning the vacuum is out side the back door, and it's quiet.
Unfortunately, the electric sanders are disposable, not repairable.