After getting it installed, everything just seems to work. Built my ZFS out of my 6 disk RAIDZ2 vDevs and presented it as iSCSI using the Wizard to VMware. I even pushed those other disks back in and extended the ZFS with an additional 6 disk vDev. All working. Interface looks pretty much the same as the TrueNAS one. I did have to remember to start the service for iSCSI as the wizard didn't start that for me, but otherwise - really nice! Performance seems very similar to TrueNAS - at least over iSCSI.