I've used the Surveillance Station on Synology for a couple of years now and it's great. It's revealed misbehaving teenagers, dishonest house sitters, rafters of turkeys, and drunk trash can bulldozers. I'm mostly happy when I don't need it but when I do use it, I'm really impressed by the features available in a piece of software that comes with my NAS.
Version 7 is a minor step forward for my use but I'm thrilled that it keeps improving. If you ever eyed an expensive setup at Costco, I'd recommend getting a Synology and some cameras before going with some of the junk systems I've looked at. You don't want to find out it's junk when you need it the most.