A couple differences between the woot WEN model and the Harbor Freight (Chicago Electric Power Tools) model:
WEN – comes with blade
Harbor Freight – no blade
WEN – 5500 RPM
Harbor Freight – 5000 RPM
WEN – 2-year warranty
Harbor Freight – 90-day warranty
WEN – $5 shipping
Harbor Freight – if you don’t have a store near you, shipping probably higher; however, returning it to a nearby store beats the heck out of shipping something like this back to the manufacturer
WEN – carried by Home Depot, Walmart, Sears; you might be able to see one before you purchase
Harbor Freight – maybe see one in a nearby HF store? Closest one to me doesn’t have a floor model to look at.
I’m not familiar with either brand, so I would base a purchase decision on these types of product differences, along with any product reviews (expert and consumer) I might find, and previous brand experience, if any, I might have.