Keep it!
I have been using the MB Pro since last november and I have to say it's the best laptop I have ever had. Previously, I had the MB White (great, but stolen from my house 🙁 ), the MB Pro older model (continous problems with the Airport 😡) and the MB Air (light, but damn expensive, too slow and again problems with the Airport 😡 ).
Finally, I bought the MB Pro. Finally the Airport works well 🙂D). The laptop is incredibly light and fast. I have used it for photo editing and gaming and it is great. Also the battery lasts about 5hr, so I do not have to use 2 batteries as I had to do with the old MB Pro. Also, you battery with 16 cycles is basically brand new. I have used it every day and I haven't noticed any deterioration in performance so far.
The only thing I did not like is the crappy 320MB hard drive that comes with the machine. I have replaced it with an SSD from OCZ Technologies and now the laptop is really perfect. The processor is superfast, so a faster hard drive provides for even better performance.
Keep your machine and enjoy the low price you paid!
Alex