I have not heard the Yamaha, but I have heard (and own) some very good dynamic powered monitors. My main system, however, is electrostatic.
Mass, single ended drive, and crossovers, still limit what dynamics can achieve, however, In recent years much progress has been made in these small dynamic monitors and mine are very clear and enjoyable on their own terms, especially listening to popular (i.e. studio) recordings, however, as the music becomes more complex (try a piano) and if the recordings are made in "real" space, the electrostats simply provide much more texture and information, despite their lack of "impact" and loudness limitations. I hope this helps, but as you know, there is no substitute for hearing them for yourself.
Mass, single ended drive, and crossovers, still limit what dynamics can achieve, however, In recent years much progress has been made in these small dynamic monitors and mine are very clear and enjoyable on their own terms, especially listening to popular (i.e. studio) recordings, however, as the music becomes more complex (try a piano) and if the recordings are made in "real" space, the electrostats simply provide much more texture and information, despite their lack of "impact" and loudness limitations. I hope this helps, but as you know, there is no substitute for hearing them for yourself.