This is a ridiclous post. You don’t know anything about what this person is trying to do yet you say they won’t be happy with the product.
I bought an AJA Io several years ago and have since bought several more, plus several Kona cards because I have been extremely happy with the quality and reliability of their products, not to mention their first class support.
On the other hand, I have bought 2 Blackmagic products (both Multibridge Pros) and have had nothing but problems with them. Each have been sent back several times (one going back today actually if I can get an RMA number) and we have had to fight customer support to get the problems resloved. At NAB this year I will be heading to AJA’s booth to look for products to replace these.
Back to this post: I can’t tell you about the AJA 4:4:4 codec, but I will say AJA has a very good reputation on Creative COW with some of the most respected editors on these boards. Head over to the AJA Kona forum and ask your question and the Pros over there will be able to tell you all you need.