Their support services are very lacking, they offer a message board where the users can help each other but the only support you get from Ubiquiti is an RMA if the camera breaks within a year. I had one of their dome cameras brick itself and the RMA replacement they send out was messed up too. They finally replaced it with another one and it seems to be stable.
Anyway, at those prices they're really not any cheaper than Dahua or Hikvision. Their DVR software has gotten much better in the latest released in terms of CPU requirements and reliability but I agree that they're not disrupting much at this price point.