Summary: I love this little guy. I store all my family videos, my dvds, photos and music and it works flawlessly streaming on hard wire. If you streaming wirelessly then that's on your wireless router. One little word here...if you have LOTS of photos and music (my library was around 6000 photos and 4000 songs) it takes a couple of days AFTER all the items are transferred for the NAS to synchronize.
Summary: I bought this so I could retrieve files from any one of my 3 computers. It does not come with any memory - I installed one hard drive and loaded all my photos, iTunes music, and regularly-used Open Office files. I have the ZyXEL connected to my wireless router, and it is quieter than my laptops or PC. I recently bought an Apple TV and discovered that the Apple TV can access the iTunes music directory on the ZyXEL without a computer being on. Very nice!
Summary: I purchased this item to use as a remote hard drive for a small office with three computers. Basically, I'm using it as a server that all three computers can access. It's pretty much plug and play. Window 7 found the NSA221 on the network from each computer. I'm a novice at networking and I found it fairly simple. However, due to my lack of knowledge, I did have to call ZyXEL to figure out how to make the folders sharable to all computers. As it turns out it was easy.
Summary: I wanted an inexpensive NAS for additional backup / redundancy for important files. I want to be clear here first. I only use this as a file share device. I have turned off ALL other features. I don't stream music, videos, or FTP, etc. So if there are complaints about those features I cannot speak to them. As far as simple storage, I put two 1.5 Tb drives in mirrored config. Very simple to install, very simple to create the mirror.
Summary: This was a piece of cake to set up. Popped in some drives, it auto-configed them and contrary to the opinion of others, it is not slow. Stores everything including my backups quickly and I can access them easily. FTP, HTTP access is quick and gets through without a hitch. Would certainly recommend to others.
Summary: After 3 failed Iomega Home network storage drives (1st one failed, next two were replaced under warranty and when 3rd finally failed, no more warranty) I was starting to look at the drobo unit. But all I really needed was a cheap NAS with a DLNA server. It didn't appear that the Drobo device (500-600 dollars for the Ethernet version) had that. A quick amazon search led me to the ZyXEL.
Summary: This ZyXeL NAS was easy to setup, easier to stream, and even better as a basic backup. The software is nothing special, but the quiet, solid box is great. I took two drives from my MS Home Server, and now I have 2 TB of working storage for my Linux and Win7 boxes.