The cameras work ok. I have one at the entrance to my driveway and was really hoping the alerts for vehicles would be more reliable. Sometimes it will tell me someone is leaving having missed the same vehicle on the way in. And large trucks or specialty vehicles (e.g. dump trucks, cement trucks, etc.) almost never generate alerts. They work fine if you just want to periodically look at the area, but cannot be relied on as a security measure. As for cellular coverage, it was easy enough to set up the SIM card and buy additional data. The cameras obviously don't move around, yet sometimes they have 3-4 bars and sometimes they don't have a strong enough signal to send video at all. I'm not sure the cameras are completely to blame, but it's frustrating nonetheless. Again, if you're just interested in occasionally looking at your property, they're fine. But, they aren't reliable enough for much beyond that.