I found this article from some time ago. However, my personal findings after 4 sets of RS3's on my VFR800, and now on my '18 N1k, reflect what RideApart said about the tire. It does indeed last a long time. I routinely got 6k miles out of mine, which to me is a "long time". That's to the wear bars.
RideApart also mentioned how the RS3's maintain its handling feel all the way near the end of their lives. I would agree with that finding. My RS3's on my VFR800 never developed that resistance to turning and low speed chopper flop so common when a front tire has worn down near its wear bars. The downside to this is, if I were complacent and didn't visually check the tire's condition, I would neglect to replace when they should be replaced.
As for Dunlop's claim that the RS3 is as close to a sport tire that one can get on a sport-touring tire, I would also agree with that statement. I've had sport tires on my VFR800 and CBR600rr before, and I honestly cannot tell the difference between those and the RS3 at street speeds. Mind you, I haul ass in the twisties enough that I can get to the edge of the rear tires (not the front). So I do push it enough although still short of track pace. The RS3's do not increase steering effort for me to notice either.
So as far as I'm concerned the RS3's are probably close to the Holy Grail of performance tires for aggressive street riders that still need long distance and wet weather capability.
One last thing: The true size of the Dunlop RS3's, and also their Q3's, pushed the limits of 190/55. Some brands will size their rear tires to within a 10% variance. So I've seen some measurements in mm wherein a 190/55 is approaching the overall diameter of a 200/55. I've also seen a 190/55 measurement in mm that is closer to a "larger" 180/55 in overall diameter. I can't remember the website where these are published I just remember seeing them. So visually compare the 190/55 Q3/RS3 and to another brand and you may see the Dunlops are just a bit bigger overall. I don't think it contributes much to handling, but it may contribute to that additional life. Plus the bigger diameter, however small, adds a bit of spice to the looks of the N1k's rear end!