They've been shipping features somewhat regularly. One I really like (but was unfortunately gated behind a $10 price bump) was being able to ask AI to find an email "where's that email about blah" or to have it summarize a long email chain "hey what am I supposed to be doing here"

Have you checked out Shortwave? One of the Firebase founders started the company, and they have a really powerful AI e-mail client.

+1 to Shortwave being great

Even though I don’t have real information, I feel that they focused so much on the power user that they must have a high level of stickiness. I don’t even believe they expected to scale beyond the ICP.

I hope, they are not getting ready to do a Rapportive.

I wonder as well -- I have witnessed extremely low churn in the people I know that use it, but that's obv anecdotal.