No, it definitely did not help. Cell Standby is the top battery user and I've dropped 10% in 30 minutes. I am on Wifi (which is using an almost equal amount of power). This is exactly the same problem I had on the original firmware.
Edit: Update - Yeah, cell standby is using up a crazy amount of power even with GSM off. Not sure why this is happening. Flashing back to SD for now but I'll try to help figure out what's going on with this later.