Anyone used a OBD reader on a GT?

There's at least a couple of companies that make OBDII and CANBUS readers for smartphones and laptops or pads. Has anyone used one on their GT? Some of them utilize an ELM327 BT dongle that fits into the OBD port so you don't have to deal with a cable.

If anyone has used either the software for their phone or an ELM327 BT dongle, I'd appreciate their thoughts on how it worked, and the specific s/w and device used. While I don't have any problems, it is more for interest to view the status of things. The stuff I looked at that's available for my phone (a Nokia N8) is OBDDoctor. But, I think there are others that would work, especially if I used my laptop verses the phone. I'm not sure all s/w can read the BMW specific codes, but the 'generic' stuff is still interesting.