I've had the 500GB Seagate Momentus 7200.4 running in my unibody MacBook for about half a year now and it's running smoothly without any problems whatsoever. Every hard drive brand and type will have it's share of bad units. Don't read too much into it. And it's true that the Seagate drives did have their problems after being introduced. But since the new firmware was released, things have been smooth all over the line as far as I can tell. No worries here.