I be enthusiastically ambivalent . these headphone sound great . not just good , but great . although -lrb- ... -rrb- rate these badboy a notch or a half below Koss 's flagship portapro , I be have a hard time hear the difference . as of this moment -lrb- hey , I have only have they for a few hour -rrb- , they actually sound both slightly better and slightly worse . the GOOD : 1 . although Koss can have a rep for be bassy -lrb- albeit in a very controlled fashion -rrb- , I find the sportapro to have a flatter response from low to hi than the portapro , which clearly emphasize the bass . the BAD : 1 . the portapro have a clear edge in the mid and high . no contest . the portapro create a larger , more realistic soundstage . they be also undeniably louder than the sportapro . you 'll have to crank up the sport a bit to get optimal sound quality and volume . the UGLY : 1 . these be hand down the UGLIEST , -lrb- ... -rrb- ugly , fugly ` phone you will ever see or wear . I take a look at the phone on my head , in the cooler more hip strap behind the head position , and my heart sink . you will look like Lando Calrissian 's assistant from the Empire strike back -lrb- that be not a good thing , btw -rrb- , whether you want to or not . conclusion : 1 . outstanding sound for very little money . these be not true audiophile headphone , and neither be the portapro . the port exaggerate bass albeit in controlled fashion , and the sport while have a flatter bass response , produce mid and high which be not nearly as impressive . I 'll keep look for the perfect price\/performance\/esthetics equation . Grados and Senns be up next ...