Threw together a JVT modem for CM7 since I couldn't find one. Audio quality seems really good as does the transfer speeds. But, it's night here, so who knows on the transfer speeds. I haven't tried GPS. Maybe a few others could test, but so far it's one of the better modems i've come across under cm7.
Phone: Google Nexus 5
Tablet: Galaxy Note 10.1 (Wifi)
Other Devices: Galaxy S3 (intl), Motorola Droid Pro, Samsung Captivate, HP Touchpad (battery died), Nook Color, HTC G1, Palm Pixi, HTC One X, Nokia 521, Acer DA220HQL, Kyocera Rise, Dell Streak 7