I haven't noticed a real performance difference from my 2010 11 inch ultimate to my 2011 i5, except on some things like Aperture when I was on vacation and looking at photos (but that may have just been my perception). But I mainly use it for word processing, web surfing, and other minor tasks that don't really tax the processor. I only upgraded because we needed another computer for another family member.
In fact, the most noticeable things for me are that the new one runs slightly warmer. The older ultimately was almost always cool -- except when flash was running. The newer one gets warm--not hot, but still annoying--a lot.
And I have a perception that the battery life is worse, but I have no empirical data to back this up, and I haven't used the latest software update to see if that makes a difference.
In fact, the most noticeable things for me are that the new one runs slightly warmer. The older ultimately was almost always cool -- except when flash was running. The newer one gets warm--not hot, but still annoying--a lot.
And I have a perception that the battery life is worse, but I have no empirical data to back this up, and I haven't used the latest software update to see if that makes a difference.