I just bought the PX-100II. I have to say, the V-Jays are MUCH better for rock/metal, anything that has distorted guitar in it. There is no EQ that can make up for the lack of clarity in the PX-100, when it comes to guitar heavy genres. When you put on the V-Jays, the guitar appears in the music, when I put on the PX-100, they get strongly veiled and disappear. The bass is somewhat stronger on the PX, but the V-Jays have a lot of bass themselves and they are infinitely better for mids and highs.
It probably depends on the type of music, but I have a strong feeling that V-Jays are better for almost anything, other than drum n' base.
I'd agree with this but to me it's not a problem since I'm somewhat sensitive to higher frequencies. If you wanted to persevere with the PX100II's you might try swapping out the original pads for HD414 pads. They reduce the bass presence slightly and reduce your perceived muddiness.