Well, besides 3 slots and 3 movespeed, it gives literally nothing, if a player goes for 4 pieces leather buff, hes most likely after evasion, making these boots kind of bad as he/she would miss out 100+ evasion later in the game.
Plate users would lose alot of hp, cloth would drop sp/magic damage reduction, in general i find no real use for the windrunners except for travelspeed.
+3 movement speed alont makes barely a difference in combat.
However if a player start stacking movement speeds from different sources, sure that could change alot.
Token + windrunner puts the player in permanent Trot lvl 1 buff (+6 movement speed)
Stacking with accessories, thats another +3, granted you rolled movespeed on all 3 pieces, having you reach 39, then you might wanna get that gun, forgot its name for another +1, we just reached +40 total movement speed!
But then again, the +3 from token would barely make a huge difference.
37 would still be enough, if a player really wants to run fast at all times.