
What do you exactly expect from replacing your audio interface? There are of course many subjective reviews saying that some interface very very much dramatically & vastly will improve quality, transparancy, emotion and you name it all. In objective measurements, differences can be clearly detected thanks to the enormous sensitivity of good measurement apparature. However, these differences are usually around or below the threshold of audibility.
So unless something is really broken, I would not expect any significant objective improvement of sound. Of course, the subjective differences can be imagined as dramatic as you like, but they will more correlated to the price, brand and looks of the unit than to anything you really hear.
Nothing negative to say about Presonus though. Looks like reasonable value for the money indeed. But my bet would be that you can as well save your money untill the FCA610 is broken.