I love love LOVE the preview feature - that is awesome! There were soooo many complaints about generic titles on the old board; this will fix that, and it saves us a lot of time and frustration.
I'm not having the same issues that a lot of others seem to have - I didn't have to create a new membership, I've not had a problem logging in and staying logged in, my bookmarks are still there, and I'm rather enjoying snooping around the board. It's kind of like when you go house-hunting, and behind every door is something new.