I have a comparison chart, but I took it down when the new PC model came out and the information around it was ever-changing.
This is the best deal you will ever find on a FLEX. I've seen used ones going for the same price (if not more). Normally they are $299+. You are paying for quality construction and performance. You'll spend less time polishing with a FLEX compared to the PC, and have the ability to remove more swirl marks/scratches. It creates less heat than a rotary and is very safe to use, there are a ton of tutorials on youtube. Its the best random orbital buffer on the market, and if you need anymore correction power you will have to go with a rotary.
This is only going on until July 5th and while supplies last. Check out the rest of the site in OP's links for other great products like Bilt-Hamber Auto-Balm, Poorboy's World Products, and Migliore Products.