No, if you use a foam-backed pad, they are terrific.Seems to me like it's a good way to get deep scratches going in more than one direction.
It may also help if you use sanding sealer and I agree with the others, start over, don't use a lot of pressure and keep the paper moving while you sand.On some of the "You Tubes" I see guys using a sanding disc chucked in to a drill that they then use to sand bowls and such. I've never tried it on a lathe. I've used them to good effect on my carved bowls that have irregular surfaces but you've got to keep the disc contact surface in line with the grain or it doesn't do well.
Seems to me like it's a good way to get deep scratches going in more than one direction.