Pros: CHEAP!! And reliable. I have seven of these fans inside my rig, and all seven work flawlessly for $3.99. They move a decent amount of air for their size and price, and they're well built. Not the quietest fans I've ever heard, but far from the loudest. Very tolerable.
Pros: Fan looks pink, but emits what I think is a very nice RED glow. I installed several like these in my new build; liked them so much I bought 5 more for my older computer. Put them front, side and back. Really added a nice glow to my systems.
Cons: Can't think of any. For their size they move a tolerable amount of air, don't make a lot of noise and were reasonably priced.