Does anyone have experience with Skiff?

There's a company by the name of Skiff, which seems to be another privacy-oriented company that offers email, document sharing and editing, similar to Protonmail.

I was curious if anyone had any experience with them, and what their thoughts were?

Their feature set is a bit limited at this point, but they do seem to be expanding their offerings at a somewhat rapid clip. I'm debating use of it.

experience privacy skiff