I'm pretty happy with the web clients but just downloaded this to give it a shot. I was surprised to see that in the initial account onboarding they ask for a password. Then once I entered that information it let me log into my provider by a wrapped page (not the system browser) which looked a bit out of date to me.

This never used to bother me back in the day. When I used these tools, I'd happily give my credentials up but I'm very suspicious of this way of registering my account. I suppose it's open source but the juice isn't worth the squeeze compared to the web clients.

The main thing that makes the web clients work for me is search against decades of emails.