Can't say enough good things about it. I mainly do mobile development, so the lack of horsepower doesn't bother me so much, and it's just so dead quiet and light.
-THE strongest and most rigid case I've put my hands on (the unibody alumnium)
-UNIX kernel
-OSX and iOS development
-More options for OSs
-No major issues with current models
Sure, you might not get the most processing power for your money, but all things considered, the overall product is much more better than competitors'.
Small, powerful, replaceable components, user serviceable, etc. I have several macs but I'm more than happy with this as a day to day, runabout laptop ("notbook").
I had fantastic luck with a Gateway I bought 5 years ago that is just now showing its age because the hinge is busted. At the time, it was their "platinum" model for developers - 2 gigs of RAM and one of the first Core2 Duo's. Sadly, they don't make an equivalent anymore that I know of, so to replace it I went with a cheap HP that I will pass to the wife later this year.
I am saving up for a System76 machine that I'll get myself over the summer, as I've heard good things about them and run Linux wherever possible.
no comment on the gateway.
One thing that annoys me looking for laptops, is the ubiquitous 1366x768 resolution. At least the pangolin has a 1600x900 screen.
It's an electronics store in NY
http://blog.herlein.com/2011/02/selling-my-linux-notebook/
he's on HN as Herlein I think...