Do not upgrade to CM10.1 if you use Bluetooth A2DP extensively

I flashed my Nexus S to CM10.1 recently and found that the A2DP streaming stutters so badly to the point of being unusable. Some googling reveals that from Android 4.1 to 4.2, Google swapped the Bluez stack that was used in Android since 2.x and replaced it with a stack contributed by Broadcom. This replacement has apparently created more issues than it has solved.

Anyway, I am back to CM10 (based on Android 4.1.2 with the Bluez stack), and all is well again. So if you use A2DP as much as I do (I listen to podcasts, 1~2 hours a day), you have been warned!