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I love the new features and better accessibility for the old ones but I might revert to 2.2 for the moment. My battery seems to get very hot in a short time. I was alarmed to see that the CMOS temperature had gone up from 26 to 36 degrees in a very, very short time and when I took out the battery it was HOT. The Exp SIM blinks constantly in live view (no flashing red light though). That didn't happen with 2.2. I could shoot for hours without the battery getting hot.
Also whatever mode I'm ML displays the message that XXX feature is disabled in current shooting mode. It doesn't seem to matter if in live view, M, P, Av TV or whatever.

I really want to love ML 2.3 as it's so user friendly once you relocate favourite features but I think I'm going to play safe and revert to the older version for a while for the sake of my precious camera (550D).

This might be another stupid question, but I see that when usingML v2.3 ML digital ISO, ISO 50 and 51200 are unlocked. Is this for both photo and movie, and on which models? I have the 550D and guess that due to the cropped sensor the noise would be pretty bad at 51200, but there are times when it might be useful, especially if shooting monochrome. Hope it's supported on the 550D. Likewise, ISO could be a real boon. On a recent holiday the light was so intense that it would have been great to use a lower ISO than experiment with exposure compensation and miss the shot.