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I have a Qnap TS412 with 4 X 2TB drives running RAID5, so about 6TB available space. It is plenty quick enough in normal use. Write speeds (On a wired GigE network) run up to about 25MB/Sec and read is considerably faster. We have all our media stored on it as well as PC and Mac backups.
So far it has been exactly the type of technology I like, it just works. The only operating issue is that it gets grumpy (Along with the rest of the network) in "Unplanned" shutdowns like a power outage. I fixed that with a smallish UPS that will run the modem, router, switch and NAS for somewhere over an hour (I did not test any longer than that) without falling over.
The only real issue I have had was ths weekend just gone. Suddenly it got a bit slow and flaky and it turned out to be a dead drive. I held my breath and hot swapped a spare 2TB drive I had into it and it calmly rebuilt itself overnight, while staying available and loosing no data in the process! RAID5 parity calculations to the rescue (It does sound odd though, reading good data from a dead drive as though it was still there!)
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