I was using the latest CM9 MOD and it was a improvement over the earlier version but still has the issue of running the battery down to fast even with Bluetooth turned off in less then 10 minutes it would be down to 94% but with the 0331 version it only went down to 98 percent in 10 minutes. Also it has a very bad bug where it does not shutdown the tablet when it gets below 6 percent of battery charge remaining or even below 2 percent, it just warns you at 15 percent and then 5 but will not auto shutdown and will just cut off so if you have it in sleep mode and forget it will not shutdown and just cut off risking damage to the system files.
I think maybe it is written for a tablet that has a different battery capacity and there for does not properly calculate the discharge rate of the battery.
I went back to 0331 but really miss and the more stable connection to the Bluetooth dongle where unlike the 0331 image it does not disconnect from the Bluetooth Dongle once it goes to sleep requiring a reboot of the tablet to get it working plus with 0331 if you have the dongle plugged in when you turn on the tablet it won't enable Bluetooth I also miss the Bluetooth Audio support of the CM9 Mod.
CM9 has some really cool features like the option to either shutdown or reboot or reboot in recovery mode or switch to silent mode or switch profiles but the battery issue is a problem and needs to be addressed.
CM10 has the same battery issue and is too slow.