Full disclosure: I have owned kJams Pro for a couple of years. I have talked a couple of friends into buying kJams. I have worked with Dave Cotter many many many times. It is a beta system designed by one person. It is much more sophisticated than iTunes where Apple has a ton of engineers designing and maintaining the application. I give kJams four out of five stars with the last star being left out until beta goes operational. I know several PC based karaoke DJs and their system is nothing compared to this. Finally, the only criticism I could provide is the frequency of updates. However, updates are usually for enhancements followed by updates to fix bugs which are fixed promptly. The guy is a genius and he is a fanatic devotee to servicing his customers. I am getting my money's worth and consider it a privilege whenever he spends the time to not only fix any bug but to teach me in the process.

So there.