Hey Big Bear!
I just bought the Ridgid orbital sander last night and have just used it. The variable speed feature on the Ridgid model is what did the deal for me. I was also looking at the variable speed PC333 model but price-wise it was almost $20.00 CDN ($13-14 USD)more than the Ridgid. Someone please correct me if Im wrong on this point but I believe that the Ridgid has a substancially longer electrical cord. I can work half way acroos my shop from the wall plug in!!!

For my hand I found the Ridgid model to be more comfortable to hold.

During use at low and high rpm, the vibration transfer to my hand seemed less than with the PC model.

It also seemed quieter than the PC.

Also, I preferred the on / off switch location on the Ridgid.

For a right handed person, the off function is simply a click with the thumb. I cant comment on how much better the PCs solid-type dust collector cup is in comparison to Ridgids cloth bag. I have heard a number of people comment that the PC dust collector pops off occasionally so some have placed a cotter pin thru the connector to correct this perceived annoyance. If I were asked by the Ridgid boys (and girls), the only suggestion for future improvement on this and other corded tools is to have the plug in power indicator light placed on the tool instead of on the plug

because it is the tool that you are looking at initially and when you find the tool on the bench, an indicator light on the tool would be more efficient to tell you that it is plugged in (in my opinion).
I guess that you could call me a Porter-Cable fan BUT....I feel that the Ridgid sander has substantially more going for it.

I dont think that you would go wrong with the Ridgid!
P.S. I dont think the PC 333 comes with any storage case and the Ridgid has a good case.
Chris