I have been using different versions of TCPMP on my 750 and I am 95% satisfied with it (does it not play .mid files? I don't see them in the file association settings). The early versions of their sister CorePlayer were pretty bad for $25. And it seems that there is still no trial version to download. Their web site is terribly uninformative.

Has anyone tried the most recent version of CorePlayer on the 750 and can you give us your thoughts?