I am impressed with
Billy's post. I am not saying at all either that the UAD converters are inferior only what I heard. Personally I think if the converters sound great then Apollo is the way to go. It is very well priced and includes the UAD stuff too which is fantastic.
It could be a ploy also to get you spend more money by getting the RME stuff and the UAD Satellite is a more expensive option by about $1200 plus so Apollo on it's own certainly looks attractive.
I think people can get a little too carried away with how one converter sounds compared to another. They tend to be much closer than we suspect. There are far more things that will influence the sound in the end result mix than the converters themselves.