I bought this 4 years ago as I lived on my own and wanted some security, but didn't want to faff about with a standard wired in alarm. I found Piper at a fairly reasonable price and good reviews, so decided to give it a go.
I have the standard version as the night vision hadn't been released at the time. Firstly the unit itself is very handy as the camera can cover the entire of my ground floor (I have a small open plan house). The camera also means I can spy on the cat to see what she gets up to while I'm out. The notification options too are very good and all work very well, and the functionality available through the system is pretty comprehensive (like house stats etc). It also gives you a pet sensitivity option so you can lower the sensitivity of the motion sensors to account for pets. Which is great, apart from if you have your system on a lower shelf that your cat insists on walking past EVERY day and tripping the alarm...
Now for the negatives. The door/window sensors are terrible. You attach them, they work fine when you test them but then suddenly trip for no reason. Being woken up at 4am by a ridiculous loud siren because a sensor accidentally tripped is not a pleasant experience. To the point where I've turned the siren on my alarm off to avoid disturbing myself and the neighbours. The sensors also have a fairly small distance range from the system (an excuse to buy multiple systems dotted around the house I'm sure) and after a couple of years, some of mine have stopped working completely and new batteries won't fix them.
The app itself is very glitchy. Half of the time I open the app only to get a cannot connect message, when there's nothing wrong with the internet. So it means you often can't set the alarm or turn it off (another reason why I've disabled the siren) . I've also found that when the app does work, it takes time to load so I'm usually sat outside my house for 5 minutes before I can turn the alarm off to go inside. Not ideal.
In short I think this alarm is a good idea, i just don't think it quite works practically with some of the software and hardware. A shame as the functionality is quite impressive.

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