Right off the bat, XB really moans at the bass.If you're listening to songs where there is crisp and delicate chimes or the most clearest ding of a bell or anything that you can hear if you turned the bass on a speaker OFF, then the XB totally ignores it and throw more bass in the mix. It sounded much much muchhhh more enthusiastic and carried more low energy than the v150 ever could, but most of the tracks I tried were muffled a bit too much by the extra bass. It's not bad when it comes to stuff like new age or anything orchestra with a cello running for a long time, but Paradise City by Guns 'n Roses sounded like they turned up the bass amp, and turned down the Guitar Amp. Alternatively, you can think of it this way. You're at a club with your favourite pop artist singing your favourite song. The song's got a bumpin' rhythm to it, your phone rings and you step outside the building to answer it only to find out that he person hung up becuse you took too long to answer. Now all you hear is a bass line going off and a muffled voice outside the club. In a nutshell, that's what it sounds like compared to the V150 (just not as exaggerated).
In short, the XB to me is like the music editor turning up the 'bass volume' in general. I still like the V150s more because it captures the sound better in everything else but bass, I'll try finding some new age or any world instrumental soundtracks with some bassy back-up instrument going off, it sets a mood and I find it relaxing, not to mention the comfort level of the cushion is probably going to be a blast to try on before i go to sleep. I haven't finished watching Hurt Locker on my DS so i'll give that a shot.