Summary: Installation is a breeze and they work! What more is there? Installed these in a Late 2007 Santa Rosa MacBook which had 1GB originally. I've had the memory installed for about a month and wish I'd done it a couple years ago. I was have trouble shutting down when I had multiple apps open like Opera, Thunderbird mail, numbers. I believe the problem was to little RAM and there was a ton of page swaps(?) going on. I'd need to do Force Quit.