I loved SunOS, Solaris, and OpenSolaris, but after the Oracle buyout all of the Sun equipment has been slowly replaced and has gone away for the most part, and with the important features being ported to other OSes like FreeBSD, there's not much of a real reason to use OpenSolaris or its babies. Having said that though, I'm put off by the name OpenIndiana, it just sounds really stupid to me, and I don't think I could ever install something like that without flat out denying it if anyone asked. It just makes me think "that's the best name you could come up with, huh? Not even anything remotely related to the Sun or stars or anything..." (I realise the origin comes from a project name, but sticking with it was a mistake, so in a sense I guess I should say "So, couldn't come up with anything at all?")
The FreeNAS community really shows just how important it is to avoid products like FreeNAS. It's built on good tech, but the issues are that the community is horrible, only tiny non-storage expert shops use it and it is broadly misunderstood. FreeNAS doesn't make any of the technology, they just repackage it. So the vendor and their community all lack the basic knowledge of what they have and the stuff that they repeat just gets worse and worse.
If this was the FreeBSD community, talking about the same technologies, the answers and approaches would be completely different. Enterprises use FreeBSD every day. They do not use FreeNAS. Once you limit yourself to a "non-expert" product, the idea of using a community for assistance causes a breakdown in dangerous ways.