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If you want a NAS for Plex, get a better one than this! Plex will run on this one, but it can be tediously slow (because this NAS doesn't have enough processing power or RAM). My original review is below. I haven't changed my rating, because this is a good NAS, just not so good for Plex!
This is my first NAS and I bought it solely for use with Plex, so that's what my review is about. I bought the 2 x 10TB Toshiba N300 package.
I was in two minds whether to buy this model as when doing research, I kept hearing people say that the lack of RAM (512MB), as well as the fact it's not upgradable, means it's not ideal for Plex use. Based on my experience so far, I would agree with this, however that's not to say Plex won't run. I have been able to install Plex and play my media without any major issues - sometimes it's a bit slow though, and sometimes videos will randomly stop, which is annoying, but most of the time there are no issues (I suspect something else is happening in the background that causes videos to pause - maybe it's the NAS doing something, or maybe it's Plex doing a library scan). Also, bear in mind that I live alone and I am the only one accessing the NAS - if you plan to use it with multiple users (i.e. more than one) accessing Plex at the same time, I imagine it will struggle.
However, for me, I thought I may as well take a punt on this model as the price of the enclosure + hard drives was pretty good. If you consider the cost of buying the drives separately, the NAS enclosure itself worked out at about £25, so I thought I may as well buy it as it will be handy to have as a backup (literally) when I upgrade to a more powerful / expensive NAS in the future.
I also purchased a Chromecast from Google and paid the £5 one time fee for the Plex iPhone app - I'd highly recommend both as this will allow you to access your content on any TV very easily - I've not experienced any play back issues at all so far.
In summary, if you are a single user wanting this for Plex, it's not a bad option. It would be better to buy a more powerful NAS with more (and expandable) RAM, but it does seem to be quite a big price increase for that. So if you don't have big bucks available and want something now, I would recommend this as it works well with Plex and let's be honest, most of the money is in the drives themselves, which are easily transferred to another NAS in the future if needs be.
I should also mention that the first NAS Amazon sent out came with two drives that had completely failed. No idea if that was just bad luck, or if something else was to blame, but needless to say it went straight back in exchange for a replacement. Amazon were fairly easy to deal with in that regard, but it was a bit annoying. I also note that Amazon's pricing is very erratic. I paid £530 for the 2 x 10TB Toshiba N300 deal, yet I've seen it increase to as much as £640 for absolutely no apparent reason, only to come back down again the next day. I would be pretty furious if I'd paid that much only to see it reduce the next day.