I use my sander extensively in my work, and it works hard.  My trusty old Porter-Cable 7336 packed it in a couple of weeks ago and I had to rely upon a little Ryobi that I picked up a few years ago as a standby.  This Ryobi is not really up to the task of real shop work and it was not very precisein its handling.  But it worked just well enough to cover until I could replace my PC sander.

That is, until its bearings seized up!  Nothing quite like being dead in the water.