Whatever you make your time worth. Basically, it's a Synology NAS running an application for surveillance. You control how much storage you need, what drives to use, how much to allot for surveillance, etc.

Fastest connecting camera app I've used and pretty customisable. If you have control systems that can execute an receive generic web commands, then you can have a lot of automation options based on alerts, whether in Home/away modes, etc.

Unfortunately, no one has written easy 2-way drivers yet. Too much snap koolaid I'm guessing.