Being that my MacBook is a machine, I won't say that I "love" it but I am very happy with it. I've had it almost a year and a half and it still runs like new. When it comes to important purchases (cars, computers, cell phones) I prefer to use them for the maximum amount of time as possible. So when the new MacBooks came out when my MacBook was only a year old the thought of upgrading had not crossed my mind.
At some point I'll likely upgrade the RAM and HDD, but I'll admit getting the black one was a bit of a noob move (it was my first laptop). Had I found this site first, I would have probably gotten the white superdrive model and upgraded the RAM and HDD sooner.
When it comes to design, it does not really impact my decisions. It's what's on the inside and how it performs that matters. But if I had to pick which MacBook "looks" the best, I would say the BlackBook and I would consider the new MacBooks quite ugly. I like that they are unibody and offer lit keyboards but that is definitely not a reason for me to upgrade just yet.