I upgraded from CM10 to CM10.1, specifically MCM’s version of CM10.1 with Siyah 4 kernel on 20 Dec 12. After a harrowing few minutes of flashing an incompatible kernel. I got it too boot. Hurray, I now get to have PhotoSphere and other nice goodies, like the pull down quick settings.
As time goes by, some bugs started crawling out of the woodwork. There was the GPS distance calculation bug, that was fixed in January 13. Others like the display bug persist. If the brightness were to be turned down, manually or via automatic, it can never be turned up. The only way to clear this bug is to reboot. At zero brightness, out in the open, a daunting challenge.
Other bugs include a noticeably lag when trying to do data entry. Swype takes a noticeable delay to pop up the keyboard. Whatsapp has a tendency to crash and require a force close. Overall, battery performance was degraded compared to CM10.
I persist until one day when the brightness bug got to me. I flashed the stock CM10.1, hoping to stay with the latest goodness. From a fully charged battery, after 2 hours, I lost 50% of my battery strength and the phone turned into a heater. On 26 Mar 13, I decided enough is enough and moved back to CM10.
It seems that all development has been shelved and the developers has gone to CM10.1 The only version I could find was MCM ROM again. This time no more brightness bug! Some may ask why not get the developer involved and fix the bug? The problem is that MCM has gone MIA for so long that XDA has shut down the thread.
Now on CM10, the battery performance is better and response for Swype snappier. Now if only Google Now is not a battery hog.