One thing I've noticed is that I still can't access it. But the reviews I've read so far praised it. This review was probably the most helpful so far.

1. It’s very easy to forget about the feed and paper trail

I'd also throw Clips into that bucket, which is even more buried. Very disjointed and hidden navigation.

One thing I've noticed is that isn't mentioned here is how none of this is built to scale once you've got a ton of mail. Maybe the intent is to simply have less in your inbox via screening? I doubt that will be the case after a month or year(s) of use.