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QNAP's turbo station range boasts one of the richest feature sets of any NAS pitched at the SOHO marketed. I found it easy to be drawn in by the extensive list of out of the box functionality; Bittorrent client, FTP, Apache, Samba and DLNA server, Linux style permissions, the list goes on.
If you can make use of those features, then the turbo station range is phenomenal value for money. However, if like me you simply have some storage you'd like attached to your network, then there are some far far cheaper options (I have an iConnect, and day to day, it's much easier to use).
The interface is web-based and functional, but some of the earlier versions let it down so either make sure your comes with a recent revision, or be prepared to update it yourself (a fairly easy process)
Lastly, I strongly advise you to get the empty version and stock it with drives yourself. It almost always works out cheaper.
The sheer amount of functions that this nas is useful for is mindblowing. This bring said, if your not the brightest spark with computers i wouldn't bother as its not as user friendly as qnap would have you believe.
The nas is capable of performing every network task you can think of but many of these functions require attention at least once a week. Ive used my ts412 for over a year now and im very happy with it.
I use it mainly for back up and storage reasons but i also use it to stream music via the itunes server and stream movies through the web browser. It performs these tasks very well but it can do so much more. These including hosting your own website, online cloud storage via mycloudnas (which is very handy for accessing your files anywhere), and use as a upnp or dlna server. I had to install a different program however for the dlna server.
There are also lots of system tools to allow you to perform admin tasks easily.
My two real negative points about the nas is many competitors now have a usb port for direct pc connection, and time machine (the apple back up utilty) is extremely buggy.
Firstly this nas does have many usb slots for expansion drives etc or even usb flash sticks but none of these ports allow you to connect a pc directly AND still have it on the network. You can connet it directly via a cat5 cable buy this defeats the point. Why qnap have left out this feature is beyond me as usually these devices are near a computer and it would speed up file transfers.
Secondly, time machine does work but getting it recognised by your imac or macbook is a nightmare. Its either there or it isnt and theres no telling when its actually finished a back up without checking your logs.