I would like to report the only problem I have had with CM7 on my DX2 is one of my apps not restoring data I backed up before flashing. Other than that, I LOVE THIS ROM! I used this ROM on my old Dinc and absolutely loved it then too. I feel at home with CM7, and since this is only a beta version, I can't wait for the final release!
It's been stated by a Google engineer that wiping battery stats will do nothing to help improve battery life.
Here's the article:
It's main purpose is to keep track of what has been using the battery. Wiping it just means you start over the monitoring of what is using the battery. It does nothing to improve or worsen your battery life.