I'm new to all this, and mostly a lurker.
What I've learned while lurking is the amount of grief (varying degrees) with most of the media servers.
I've had more than my share of Netgear hassles with bad switches and routers, and their endless games of honoring their warranty.
I'm not interested in more of that grief.
I don't mind ponying up the cash for a Dune, but the No Return policy, and skimpy warranty do not impart a level of confidence for that much $$$.
The thought of being stuck with a dead $300 turnip is not thrilling.
Also, I'm in the middle of Yet Another Caviar Green 2TB disk crash.
Half of a RAID1 pair bit the dust, so I had to immediately take a full copy to a 3rd 2TB drive from my stock.
The chances of the 2nd drive failing during the rebuild process is too risky.
NAS4Free and the others do offer the ZFS file system and ZRAID2 or ZRAID3 protection.
But... the chronic failure of 2TB drives makes this a real annoyance.
It takes three (reliable) 640gb drives to match the capacity of one flaky 2TB model. Very pricey.
It seems so much less hassle to just stick a BD disk into a BD player and be done with it.
I'm 38 years into the computer service business, so perhaps I'm just a bit jaundiced...