Not yet, but I will.
The previous public build (990173083) has an annoying bug with the cluster wizard.
If you don't complete the wizard or cancel it, next time you come back, the Configure Cluster button is broken, and you can't start the wizard again.
Nothing I tried could fix this, backup/restore to a new unit even brought the issue in.
TAC's solution was to upgrade to a later private build, which at first seemed to fix the issue, but really only reset the wizard's state.
Learned it the hard way when I (re)scheduled the cluster setup with my customer, checked remotely the day before that the wizard button was OK, did not cleanly disconnect, then could not use it again on D day...
Also, the same units were highly unstable for a while, which was seemingly due to running the DHCP service for a /23 network.
(What pointed me to this direction was ugly errors in the DHCP log, and an UI bug which forbid using a 192.168.0.A to 192.168.1.B range with B lower than A).
I did not really investigate it, moved the DHCP service back to the NAS where it was running before, and they've been stable since then.
I like seeing things like "General stability fixes and performance improvements" in a changelog.
Let's hope this new build lives up to it.