Well you still didn't tell me about what you had to get used to besides the battery issue.
Honest truth is I don't even remember most of what bothered me. I just figured it out and got past it.
I had the same contrast issue as Jon, and after some playing around I was able to satisfy my eyes.
I've got some font size issues that I can't get around.
I hate that opening a new Text Edit window while I've already got one open no longer generates a new free-standing window.
As you can see, nothing critical.
(PS: Next time you run into one of your recalcitrant websites, please post a screenshot of the Safari pop-up.)