Apart from the irritating touchscreen sound the only problem for me with this ROM is battery life when WiFi is enabled. By default (and pretty much always) I do not have mobile data turned on, and use WiFi only for all my data needs. With ICS I could leave WiFi enabled 24x7 and not worry about it. With this JB ROM the battery drain rate increases alarmingly whenever WiFi is on, even if my apps are placing light data demands and the phone is left dormant.
Here is a battery utilisation graph for last night. It represents the time period from 20:15 in the evening until 05:15 this morning. The battery was at 100% at the start of the plot and WiFi was on until 23:00 when the timer turned it off. There is a little time with the screen on between 20:15 and 21:15, but not much. The drain rate with WiFi on is alarming. This is a clean install with Odin onto a wiped device. No bootloops or other quirks, just terrible battery life with WiFi. I've even frozen several unnecessary apps and turned off Google Now. It doesn't seem to help. To lose 15% in 3 hours (empty in ~20 hours) from a phone which is barely being used is just wrong. This thing would go for a couple of days at least under ICS, with WiFI on.