Really bad experience with the seller. I sent back my MB pro with warranty. They didn't communicate about the service at all, just sent me back the laptop saying "the error is my fault". They didn't even offer that they would fix it for money, they just sent me back the machine. They offer machines with less official apple warranty, so they "cover" the rest of the warranty, but if you have any problem after the official warranty when they "cover" it, they do nothing... I took the machine to an official service, and they said that they would fix it for free if the warranty was covered...
Lesson learned, better to buy everything in the official apple store!