Nobody has posted yet about the XXLQ2 ICS for XEU, so maybe you've all installed the German version already and everything is hunky-dory.
I got notification that LQ2 was available on Friday. I flashed it through Kies (I wouldn't normally, but couldn't be bothered to download from sammobile). Installed OK, non-wipe (yes, I do know better, but ever an optomist), set up my homescreens again. Couldn't see much change from GB.
Yesterday everthing lagged, scrolling was jerky, the keyboard wouldn't appear, and the battery was nose-diving. Ah well, as expected, it needed a reset to clear out the GB remnants. Wary of doing a hard reset in ICS, I flashed back to GB, reset, and reflashed to LQ2. Reinstalled all my apps, set up wifi, email and homescreens. But still jerky, still lagging, keyboard now appearing but randomly not responding, battery still plummeting. Next step - remove the battery. No change. Took a deep breath and wiped in ICS. No change. So, this afternoon I flashed back to LA6, in the hope of getting my beloved phone back. Reinstalled apps, set up wifi, set up home screens, etc, etc.
So, after a wasted weekend, I'm back to where I started and staying here.