The CUVC 3500 and 5200 were/are OEM products from RadVision. The most notable difference was HD support in the 5200 series. Personally, I would require a very compelling reason to be investing in these right now. Cisco just bought RadVisions major competitor: Tandberg Codian. I have no specific product roadmap information here. All I can do is speculate that in the long term, it must be cheaper for Cisco to sell Codian hardware than resell RadVision hardware.