Pros: cheap (when Amazon is selling it at a sensible price - somehow currently it's going for over £100! - but usually under £5), can work from a USB port or batteries, the soft blades are very safe and it gets a good flow of air going to cool you.
Cons: it is relatively noisy and being a small fan, the cooling effect is very concentrated.
Overall - it's a cheap fan (when priced properly!) that does a cheap fan's job well. It'll nicely cool you at your desk, doing a better job than a small handheld fan, but isn't suitable for cooling a room.