Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Production Gear › Live Chromakey › Never hear of Datavideo
I never heard of Datavideo, but the DVK-200 looks promising for the price and features.
As a side note I have seen in action the Tricaster's (I believe it was the 8000 model). This is the best of the best you will find out there, it has everything you could possibly need for chromakeying and more. The only problem is the price. After a 1.3 h demonstration of the Tricaster I asked the seller how much it cost…he said $40,000!!!