I find there are a lot of people who know very little about NAS's and have never owned one yet are very critical of the 'snobs' who recommend them, the irony of course is those recommending them, have owned them and know what they are talking about, at least with the model they own. Since NAS's are for the most part, personal use, when used in the home, their needs and requirements vary however most people use them for storing content they want accessible from any device on their network. I happen to own five NAS's from four different vendors and bought my first one seven years ago, so I am quite familiar with them. To say that reliability is not important is nonsense in my opinion, if you are buying something to store content on you want that content to be available anytime you want it, so reliability is very important. The main difference I have found between lower end units and higher end ones is network speed. Simply copying a file to or from a NAS will go quick or slow, higher end models have dual network ports and you can bond them on a gigabit switch for maximum throughput although this is something that is not important to every one. Expandability is important too and once upon a time this was a big differentiator between higher end and lower end units, the higher end models allowed you to expand to more or larger drives on the fly, no losing your data, but I believe they all offer this now. There isn't much that separates the Qnap's from the Synology's anymore except maybe build quality and the odd feature here and there, they both do the same thing. The point that NAS's are NOT a backup is an important one that is often overlooked, people assume that drive redundancy is infallible and they are wrong, it is not. Its now a question of IF my drive(s) will fail, but WHEN. If you buy a NAS and plan to store important data on it, have that duplicated not once but twice even, to drop box or an external hard drive, it doesn't matter what, just have it duplicated.RAID is not a backup, but offers a safeguard from drive(s) failure, RAID arrays can get corrupted, multiple drive failures can occur, so plan for this. Also when buying a NAS, plan for future expansion and get a four bay instead of a two bay, even if it blows the budget, in most cases you won't regret it down the road.