This will replace my MBP 15 dual core 2.53 GHz machine with 8GB RAM & 160GB Intel SSD. Performance wise, the two are very close. Obviously, the MBP is faster, but not by much. The form factor of the Air is incredible! The speakers are insane. Better than the MBP running closed and hooked up to my 24" LED Cinema. Only gripe is the lack of backlit keys, but we will see how that manifests itself. I ran my MBP 'backlight out' for the last several days and I was fine. The fans also seem a little more eager to come on. Really amazed by the useful power of this little computer. If you are thinking about one, go for it. This is my primary work computer. I also have an iMac, he does the heavy lifting like handbrake for my appleTV.