I've had my Core Duo (1.83 Ghz) MacBook Pro since May of last year, and it is the first Mac I've ever owned. I bought it refurbished and have never been so pleased with a product. I was rather suprised it came with an upgraded hard disk (100gb 7200 RPM SATA) and an extra 512 mb of ram for no extra charge. Maybe I was lucky? Even after all these months of use it still feels new. The battery life has held up and the only problem I encountered was a slightly loose latch that seems to have fixed itself. I've never had heat problems or hissing/mooing noises reported with revision A MacBook Pros. Overall a great improvement over my previous laptop, a Pentium II Dell Latitude that I saved from being thrown away in early 2006.