The balance meter in the REP is a feature I haven't found in any other recorder that is as reliable as a RockBoxed iHP-120/140. For me, it has become indispensable.
I find even minor L/R bias in concert recordings annoying. Using the balance meter makes it so easy to correct any L/R level differences while recording, rather than having to do it in post production.
To me the histogram is not that useful...
Anyway, Petur, I really appreciate the effort you have put into this.