The new mail in Lion looks more like the iOS version. I noticed I did change back to the old look and I was wondering how you are experiencing the new mail in everyday use, and what kind of settings you use.
One thing I noticed is that I prefer to have the left bar (with smart filters). I guess a lot people choose to "show column".
Another thing is I switched back to the classic view. This way I can see more in list view and I'm not really looking at the first sentences of each mail which are shown in the "new view".
The new view doesn't give me the feeling of "overview".
Another huge thing is Apple by default interprets mails being sent back and forth, and shows them as separate containers, like the Facebook wall. However, I get confused when there's a conversation between multiple people going on. Sometimes I think "hey, did I really include person X in this conversation? OMG!". But when you look deeper, it's not the case.
It also *groups* messages by conversation. It's easy to accidentally delete a whole conversation.
So, I sort by date, turn off "group by conversation" and turn off "Facebook wall-ish view".
Basically I end up with a very traditional Mail version.
I'm curious how you use mail, since a lot of what I wrote here probably is an unwillingness to change to something new, but perhaps there are some changes which are a step back from the old Mail?