LOVE the features!
I purchased 2 of these for use at my church as we were getting um... "challenged" by instances of folks bringing in a variety media sources for the services. Having the ability to do audio or MP3 from either CD or thumb drive has helped a LOT!!!! If needed, we can record what they have onto a thumb-drive via our media recorder, pull the drive from that and quickly toss it onto one of the MP103's and cue it up.
The ability to transpose Worship backing tracks has come in quite handy as well!
The only problem we have had has been intermittent (and I need to look into it further...).
When playing a CD, right after the units are powered up, there have been instances where the Cd gets "stuck" and will repeat a small snipet (1-2 seconds) over and over and over. Stop the play, wait a bit, restart the CD, and it works just fine. Try another CD, and it might or might not work. The only thing, to date, that we have found is to power everything up (BTW, the players ALWAYS are powered up LAST.) and wait a couple of minutes BEFORE trying to play anything in the CD players. Zero issues with that. I am almost wondering if there might be a grounding issue...
Other than that small issue, we REALLY like these units!!!!