Got the PowerForce recently in white and... not bad actually. I'm a fan of the Panny RP-HTF600-S for casual PC/YouTube/Gaming at the home PC and this one is definitely better!
Also, I got the Spider "Moonlight" headphone... is basically the opposite of these... bright as hell, airy and wide soundstage. Purrin, If you'd like to measure them, let me know! :-p