Screenshots etc. at http://www.wuala.com/grahamperrin/publi ... de=gallery and http://www.wuala.com/grahamperrin/publi ... de=gallery – maybe more in due course.
Without going into detail: for most purposes I'm very pleased with the combination of ZEVO Community Edition 1.1 and OS X 10.8.2.
On 23rd September I noticed something unusual, pleasing: a drop in the percentage of memory that was wired. Shots from 21:43 and five minutes later, 21:48:


At a glance, it seems to me that memory usage of ZEVO is improved (compared to Ten's Complement releases and private betas) – consistent with the GreenBytes statement "… custom ZFS memory manager is finely tuned …".
On the other hand, I have recently abandoned compression=on for my home directory. I wonder whether that change to the dataset was partly contributory to the apparent change in wired memory behaviour. (I never found a problem with compression, I simply wanted to see whether usage feels different without it.)