I Like this unit ...but
I've dealt with a number of these since they were launched but I have two serious issues with it.
the main one is the lack of a firewire port (at the moment I'm not interested in USB3). Migrating from an older mac to one of these is a right pain in the bum. With FW it is straight forward and easy to move the entire content of an older mac to a newer, and it's relatively swift.
The options that Apple offer to migrate your older mac to your new MacBook are quite frankly awful.
The default mechanism is to use the WiFi connection. Four days later it may be finished - if one of the machines hasn't got bored and gone to sleep in the meantime. The alternative is to use an ethernet connection - well that probably will take half a day. But that is only part of the problem.
In order to use the new migration system (either method) a piece of software has to be installed on the older Mac. It's on the CD that comes with the Macbook - but the installer is intel only so it won't work on a G3 or G4 mac. So you go to the Apple website to download the app from there - assuming that you can find it. Why is it so well hidden?
Then you install it onto the older Mac - as long as it is running 10.4. Many (in fact I would say almost all of mine) clients are still running 10.3 on their G3 imacs and on their G4s.
Therefore you have to upgrade the OS on a machine that is going to grass once the tranfer is done.
In my experience it takes almost 6 hours to transfer an 80G mac because of this, compared to about an hour with a FW equipped mac. (And that is if all the upgrades and installs go well the first time!)
The other issue is that the two USB ports are too close together. You cannot stick 2 USB sticks in at the same if they are not the slim variety.