[tjlemke]

It's all a pointless discussion anyways since as others said we're talking about pure fantasy. If you maintained your mass when shrunk sure you'd be more powerful technically. But the trade off probably makes it a useless power. Take a person and reduce their volume to one tenth of what it was while maintaining mass would not only make them MUCH more dense but they'd probably start sinking into the ground the second they stepped onto a soft spot. Even if you could somehow compensate for the extremely high pressure (normal force) you'd still have the issue of not being able to land on anything that isn't concrete or stone. I don't care how strong someone is, quicksand beats them more than not.