I wouldn't get one of these if I already had a computer, but if I didn't and needed one, I'd consider it. Some of the features are cool, like this one:
Distances: today & yesterday, this & last week, this & last month, this & last year, total distance
But the arrival time is kind of dumb. I know how long it takes to get to work, and I also know how far I am from any block. I don't need a computer to guess. It would be a non-issue if it wasn't the biggest data field on the screen.
A thermometer is kind of nice, at least in the winter.
Carbon Offset: today & yesterday, this & last week, this & last month, this & last year, total carbon offset (offset 150g carbon/km or 240g/mile)
It's pretty easy to multiply by a constant - calories is basically the same trick, but with time instead of distance.