There is much I like about the new format, including the ability to skip directly to messages that interest me. I now see that I can cut-and-paste previous comments if I wish, but they no longer appear automatically, which was convenient. I can also reply directly from my email client (Google, in this case) without going to the website, just as before.
However, the roll-out has been problematic. Why am I now receiving 3-4 Daily Digests a day instead of one? Is there a limit on the number of messages for a digest, perhaps?
Why do some posts have no private email addresses to which we can reply? That requires public replies when that is not necessary?
I assume these bugs will be worked out sooner or later, but I hope it's sooner.