How do you mean? I trust OpenZFS more and in fact would consider it negligent if Oracle wasn't cherry picking OpenZFS bug fixes. Several original Sun engineers including ZFS co-founder Matt Ahrens are involved with OpenZFS.

Yes, as I have elaborated upon at length[1], the ZFS engineers have long-since left Oracle -- and the open community's ZFS (that is, OpenZFS) has become the ZFS of record.

One clarification: Oracle can't actually cherry-pick back OpenZFS bug fixes because they are (ironically) violating the CDDL by not making available source code. This isn't an issue for the code for which they hold copyright -- but that doesn't include any of the bug fixes and features that we've seen in OpenZFS since 2010. And yes, it is absolutely negligent, but of a different sort than you intended...

[1] http://www.youtube.com/watch?v=-zRN7XLCRhc

Cheers Bryan, that's a great one of your talks and thanks for the interesting licensing comedy.

Do you mean they're holding back progress? With OpenZFS on the scene, it's highly likely that the original Sun/Oracle implementation will become irrelevant to everyone apart from users of Oracle's Solaris releases.