I bought this to use as a network drive connected to my home router. It's by far the best value in terms of capacity vs. cost in a drive that's USB powered. 4TB in a drive this size and with no external power supply is something that would have been unfathomable just a couple years ago, and at this price too!
Generally I've been very happy with it - it's been working perfectly for the role. I mean it's just there whenever my wife or I need it - I click my network share on any of my machines and there it is. Not much more you can ask - in this role, network speed is really the limiting factor so while it might not be the fastest drive out there, nothing else is going to feel any faster.
The one caveat is, surprisingly, noise! It's a noisy little drive. I don't hear anything unless it's in use, but reading and writing causes noticeable "seek" noises, which can be pretty annoying. My router (and drive) are in my living room on a shelf below my TV, and even though the drive is also behind a closed glass door, the seek noises are clearly audible from across the room.
This isn't really a huge problem for me because most of the time the drive is either idle or in use when I'm *not* in the living room. If I am using it in the living room to stream a video on the TV or something, it's usually doing a sequential read so seek noises aren't that noticeable. But when I'm doing a backup or something from my laptop on the couch, it can be a little annoying. It's a surprisingly loud drive for what it is - I actually haven't heard a drive that sounds like this in years. I guess that could be part of the reason why it's so cheap.
One other thing - Seagate's included backup software doesn't recognize it as a network drive. (It does if it's directly connected, but no reason why it shouldn't see it when mapped as a network drive.) No big deal for me as I use FreeFileSync anyway and that does work fine over the network, but again just something to mention if you were planning to use this drive that way.
Still recommended for most uses. If you plan to use it really heavily in a quiet environment, just be aware that you will likely notice the noises it makes.