Just my take on this (and I know there are those who will disagree), but Novak is crap.

The capacitors they use are the cheapest that can be found, so the rest of their components are suspect, as well.

When I first began buying their products, the capacitors were popping all over the place, one caused a fire. Of 6 systems I purchased, none of them now work. They are all sitting in some landfill somewhere. One system was returned for repair, and promptly went kaput the moment I turned it on. The warranty wasn't honored, and all charges paid were out-of-pocket. I have since become a Castle Creations devotee. THEIRsystems are BULLETPROOF.
I have 7 CC systems, and all are still running strong. They are also adjustable by PC. Novak's aren't.