Road tested the ZARs tonight in a full live band setting. I won't be going back to the ZS 10s!! It was perhaps the first time I've actually enjoyed having IEMs rather than feeling "they do a job". Clarity was so much better - I was able to significantly reduce both the bass in my personal mix and the overall IEM volume setting too, and consequently found myself getting a much better band mix as well as hearing my bass really well.
I appreciate that's just my personal experience from one gig with the ZAR's, after many using ZS 10s, so feedback from the other recent purchasers on this thread, once they've had a chance to use them live also, will hopefully either confirm my comments, or give a more balanced picture.