So far unit works very good. Accepted my cameras and 2 TB HDD with no problem. Software is a bit harder to get used to from other DVR's I've purchased, but that's to be expected as they are not all the same. Just wish it had come with a remote control for lazy people like me, and a front USB port would have been useful. Internal cooling fan would be nice since HDD and board creates a lot of heat in the summer months especially. Time will tell if it should get 5 stars or go lower. So far I'm very satisfied.