It looks like a solid UX with good security.

Got any experience with Casa/Unchained to compare with?

I have no hands on experience, but Unchained's 2-of-3 looks similar, maybe just harder to access/use co-signing. So more positioned as a stone cold storage than a bank. Casa seems similar, although the variety of setups described on their site makes it quite complex to understand how the cosigning actually works.