I just bought the Sony XB-500s. I posted a few messages asking people for advice, and I always said I wasn't a basshead. I went to the Sony store and tried these on in addition to the V6 (Felt flimsy to me! and I hate the way they so readily collapse) and the ZX-700 (These were good), but I realized after hearing the bass on the 500s, I love bass. And hell, I listen to rock music, not hip-hop or dubstep.
So I have some advice for anyone shopping: Nothing beats trying them on. There's no way you will know how you like something until you try it on. I went to Best Buy and I hated the way ALL Sennheisers felt on my head. Who would have guessed?