Just wanted to give my two cents - been using it for about 3 hours at this point.
I downloaded the ROM over wi-fi via my CM7 ROM onto the SD card. I made a full nandroid backup, then used ROM Manager to install.
There was an instance during the system software portion of the install that I thought it hung up. Be patient, it felt like I waited 10 minutes for it to complete.
Once it installed, it went through a reboot and hung for a little while on the HTC white screen. Again, was VERY patient with it and it went through.
On initial load, after pulling down the lock bar, it went back to the HTC white screen. I was having luck with my patience, so I waited a while for it to load up. It eventually loaded into ROM.
I was getting a force close error after flashing when working with some of the menus, but ROM Manager's permission fix seems to have worked that out.
All in all, I think being patient and not ripping out the battery will help if you run into issues. I would say if you are waiting more than 20 minutes, something probably went wrong.
Everything is working great at this point - I missed having a sense ROM, it turns out. Loving the new skins and profile settings. Seems to be pretty smooth so far.