Is there a reason you need MacOS X as your server OS?
Plenty of other options out there which have more testing and have substantial history with ZFS. I'd seriously look into OpenIndiana or similar - I run this with much success on an HP Microserver, which has plenty of expansion possibilities with a small form factor, ECC RAM, etc.
If I was the developer, I'd see about giving away the low end version as a loss leader. As is, charging $20 = less people will test it = less stable.
I wanted to reduce the amount of constantly running computers. I still want a desktop/media center, I wanted to combine that with [ZFS] file server. I'll probably end up running FreeNAS + a desktop. The reason I don't want a FreeBSD or Illumos-based OS as a media center is because of no Netflix streaming support, and Flash performance is poor too.
Plenty of other options out there which have more testing and have substantial history with ZFS. I'd seriously look into OpenIndiana or similar - I run this with much success on an HP Microserver, which has plenty of expansion possibilities with a small form factor, ECC RAM, etc.
If I was the developer, I'd see about giving away the low end version as a loss leader. As is, charging $20 = less people will test it = less stable.