I recently did a complete system upgrade – hardware & software. Previously I had a Decklink Pro HD and so this time I did a lot of home work and considered the benefits of all cards against cost.
Most important to me was good quality up/down/cross conversion, plus dual SDI inputs and outputs, as I feed my HDCam and digi beta simultaneously. I also knew that I had some projects that were going to be RED 4K and the ability to work with 2K files being converted and displayed correctly on a 1920 x 1080 monitor was also very important.
So in the end the winner was Kona3. It actually did the best job on all those tasks and I also knew it would be only getting better with time as the AJA support and development is also impressive. As for cost, I value my time and the reputation for being able to handle anything at quality with speedy turnaround. So the Kona3 was not expensive given my expectation of many years of profitable trouble free work.