Why not get a real apple charger for $60 on eBay?I've done it before in the past and haven't had a problem. I don't like the idea of using 3rd party chargers and even go as far as checking the voltages with a multimeter prior to use. Regardless never had a problem.
This one has overwhelmingly good reviews.
As long as you can you are completely sure its not a knock off that is also a good option. Basically I'd rather buy 3rd party product that claims to be 3rd party vs a 3rd party product that spent all their R&D trying to be a successful knock off. I got burned on eBay once however Amazon can be just as bad....Why not get a real apple charger for $60 on eBay?