I recently swapped out my stock 160 gig hard drive for a 128 gig Corsair SSD on my Macbook Unibody 2.0. It's the same Samsung model with a Samsung controller that Apple uses, just rebranded. Today I looked at the battery meter after a full charge with everything on (wifi, bluetooth, etc) and display at auto brightness and saw 7 hours! I only had the web browser running, so obviously I'll get less doing anything more intensive, but I'm impressed at how efficient this SSD and OSX are at power consumption!