RK3s are fantastic fins, they are a little weightier than the quattros but in my opinion they outperform them especially when it comes to maneuverability and longevity. The colour of the RK3s can only really be appreciated at the surface however (speaking of my orange HDs) the colour is washed out pretty quickly and anything after 10m they just look brown, the white and yellow seem to hold up better though. Still not a comparison to the bright Mares colours but diving isnt just about looking good right?