The unit has been rock solid since hooking it up (almost 4 weeks now). The instructions are just okay, but if you're somewhat mechanically inclined - you should have no problem. For those that struggle with those types of things, YouTube is your friend!!
I added an external 12v power supply, but also have it to hook up to a battery in case of electric outages. The app is not that intuitive.. but one can get by.
Would I buy it again? Yes... and I did. :)