I've never owned a mac book so I can't vouch for its quality, but if you do decide to go for it make sure to purchase Apple Care. I had my iMac repaired twice - to replace the monitor glass and to replace my HD. I had my computer back in 1-2 days both times, which probably wouln't have been the case under a PC care plan.

Also, if you have an issue with your Mac you can take it to any Apple store and they won't charge you if they resolve the issue on the spot (they won't charge you regardless under Apple Care, but this applies to units out of warranty too).

Basically I think Apple's customer service is better.