I am also interested to hear how the avionics compare to ATR-72, especially the -600, with it's full glass cockpit that i am currently trying to find AOM for, or any manual, so i can analyze it.
I suppose, because of the full glass cockpit, q400's avionics, despite it's quirks, is much more user friendly/ load reducing than the atr-72-500.
Although there is a whole bunch of threads about this very comparison on pprune (and i am looking through all of them), any additional first hand experiences from you guys would be great to hear!