I'm always on the lookout for altimeter computers, as I tour and am, um, not great on those long uphills.

I go with wired these days because I'm tired of interference, re-pairing, not knowing which battery is dying, etc.

The 2.0 is better than previous iterations: the altitude sensing, though still just barametric, seems more consistent than previous computers. The numbers match up w/ ridewithgps quite well, and the displayed grades don't jump around like they do on most computers. On the Cateye Adventurer grade jumps from 5 to 9 to 4 to 8 etc., while to all appearances the actual grade remains constant. The 2.0 doesn't do this; they've clearly put in a smoothing algorithm that makes it a bit slower to react to changes but gives it a much more reasonable set of outputs. So that's the plus side.

The downside is that the display organization is horrendous. There are many different pieces of information that can be shown, they all have dedicated buttons (there are five), and space utilization is terrible. For example, showing trip distance requires three lines on the display! 1) the actual distance, 2) "TRIP DISTANCE", and 3) "MORE", which indicates that there are additional trip functions that can be swapped to. Each of these lines is the same (FULL) size; the phrase "TRIP DISTANCE" is the single largest item on the screen, and it never goes away while showing trip distance.

The planet bike 9.0 that I have on my commuter is better in almost every single way: nice pleasing single-screen organization of info, and only a single button that quickly brings up useful info. The downsides are: 1) no altimeter, and 2) no backlight.

Though I love altimeters while on tour, I'm seriously considering just using a planet bike. After all, there's only one 2k climb averaging 13% on my upcoming tour, and I really don't think I'll miss it.