I had a couple of these fans
(Link). Overall, were decent at moving some air around and were good quality. If you're looking to buy something in this style configuration, I'd recommend them. I want to say that I looked through several models and this was sort of the best mix of price, quality, and CFM rating. Looks like they have an even larger size now. Probably the only complaint is these style fans are louder than a ceiling fan.
Since then, I replaced my garage door openers with a Jackshaft style opener. Since this eliminated my chain openers, I added a couple of cheap ceiling fans in their place. More centrally located, quieter, better CFM ratings - overall, much better effect for less money. If you could swing a couple ceiling fan, I'd recommend it. I've taken the wall fans down since. They weren't bad - the ceiling fans were just much better.
Good luck