Pros: The drive fits in a 13" MacBook Pro without any problems, and so far has been working just fine. It feels similar in speed to the 5400 RPM Hitachi I had in there before, though I have not run any actual benchmarks. It's a solid product, though obviously that opinion is based on only a week's usage.

Cons: I've heard a very soft click from time to time. There's no associated performance hit, nor is the sound audible in any but the most quiet environments.

Overall Review: The machine is a MacBookPro5,5 : a 2.26 GHz 13" MacBook Pro from this summer. I suspect that any unibody machine with non-removable, integrated battery would be able to use this, given that this is the smallest of that line and it fits in here.