See my specific comments on HS in the 10.030 beta thread (
http://yabb.jriver.com/interact/index.php?board=3;action=display;threadid=18276), which reprise some thoughts in several other threads.
Some more general thoughts:
As you will note from my comments in the above beta thread, the two keys for me are the ability to limit what is shown in a customizable way so that I can run portions of MC from another front end, e.g from myHTPC. As great as MC is at what it does, there are some things that will always be done better by other apps. Therefore, in addition to offering a comprehensive solution for those who want it, MC should also integrate well will into front ends that are used to access multiple apps. It doesn't do that now, and MC is such a great engine for cataloging and playing media files that it kills me!
It seems like J River has already done the hard part by making a relatively stable, powerful media database, manipulation and playback engine. If you made the suggested improvements to the HS interface, I really think you could become a must-own app for those operating a HTPC.
I hope this is helpful.
Doug