Ugh. Thanks for summarizing Seeed’s answers on this. I purchased over $400 (US) of Xadow parts for a project only to find that the I2C and power busses are so bad on the Edison board (which they’ve since discontinued) that the project won’t work. I came back to buy breakout boards to try to interface it to another micro controller with a stronger power supply (you can’t power the board on if you have both the OLED and the GPS hooked up at the same time, for instance, presumably due to a high inrush current in the OLED) and better I2C pull-ups. However, they’ve discontinued those too. Soldering a 0.5mm pitch connector by hand is, unfortunately, beyond my soldering ability.
Seeed, if you’re reading this: I had previously had good experiences with Seeed’s circuit board orders, but unfortunately, after this experience, I’m unlikely to ever deal with you again. I’ve now spent $400 on stuff I can’t use and it’s been so long, I can’t even return it. I guess I should’ve returned it immediately, but I thought Seeed was committed to Xadow and specifically to using it with Edison. Apparently not.