I have used the Ensemble and it was great but I now use the Prism. I had minor issues with swapping tasks, using one for Kyma duties and one for general purpose use. So I now go digitally SPDIF into the Prism from a Motu Ultralite, (looking to get a Track 16 at some point for ADAT in) This way I still get the great conversion without the issue of picking up the soundcard after using it with Kyma. Hope that helps. They are al great interfaces.
Best of luck
Simon