I like the idea, but using the Mullvad Browser with Leta was mildly annoying, as I would have to sign in (acct#) for each search. I get it, but I wish there was a better way to authenticate. The search results were surprisingly good also (as expected).
I wanted to try it more, but unfortunately I couldn't figure out a way to get Tailscale and Mullvad to play nice together on Windows (my work laptop) and on Linux (Desktop). There are some guides for Linux but none of them worked for me. Split-VPN feature didn't work for Tailscale either.