I'd say the experience is quite easy, especially when using browserid.org/verify for verification.

My biggest criticism is the lack of a concretely defined spec for how the Verified Email Protocol works, if one wanted to implement it directly, rather than relying on browserid.org.

Based on the code in the repository, the protocol seems relatively straightforward. But, as it currently stands, it'd be difficult to implement it based on the paper spec alone.

Anyway, nice work on BrowserID. I'm excited to see where its headed.