Yeah FD05 is the latest published ICS build for the E4GT. It's been really stable and has been running quite well for several builds now. Here are the remaining bugs that have been reported:
Notification bug - When a call ends, if you manually back out of the dialer by hitting the back or home buttons, before the call screen ends on its own, sound and vibrate notifications will often stop working until the device is rebooted.
Bluetooth - There are still lingering Bluetooth compatibility issues. It works perfectly for many devices, but not all. I've personally had a lot of issues with Bluetooth on the ICS builds in both of my cars.
4G - Can lead to random device reboots when enabled.
There are other issues that need to be resolved, but the above are really the big three right now. Oddly, the last few builds haven't seemed to address any of the issues that have been reported for awhile now, so I'm not sure what they've been working on.