we have installed about 20 32 camera maxed out dvr's made by optiview vr32 enterprise series and we had a couple system failures causing issues during initial cutover however after troubleshooting initial problems and fixing problems the systems have worked solid for the two two years we have been installing them. the problems seem to have been with the original camera's that we connected to the new system and were using existing cables and when we replaced the cables and the problems went away. they also make a 48 port system and i believe a 64 port system is in the devolpment.