I got the barometer watch! It's real ugly. The barometer seems pretty accurate when I check it against NOAA's website, and the compass is cool.
The altimeter tends to drift, though, so I have to reset it against a known elevation least once a day. Also, thermometer only works if it's been off my wrist for about 30 minutes because otherwise it factors my body heat into the reading. It's not the informational powerhouse I'd hoped for, but it's still pretty great.
The best thing I've learned from it so far is that if you sit on my toilet, you're facing due south. The residents of my house all agree that's fantastic feng shui.