Damn, I was afraid someone was going to say that about VAAI.Beside the napp-it free edition there is a Pro edition with support and some extra features. After first setup there is a 30 day trial of the additional Pro features (no OS/ZFS restrictions, mainly comfort features).
There is currently no VAAI support in the free Solaris forks beside NexentaStor (there is a free community edition - forbidden for commercial use and with capacity restrictions) but for VM storage NFS is as fast but much easier than iSCSI and you can have concurrent SMB access for copy/clone/move/backup with snaps as Windows previous versions.
I really don't want to be without VAAI so what are my options here?