My reason for wanting to try it was the the rest of the runner group was so twinked out that I didn't get to do anything. Ever. Even in spell-casting situations, the morons would run into combat and start hacking at stuff.
So I made a mage who went really, REALLY fast. A mage going that fast is very dangerous, because they go in the middle of combat, rather than the end, and suddenly, combat ends in the middle of all the brainless street sams hacking at things.
As we became more powerful, everyone else twinked out thier characters even further, but instead of making my character faster, I made him more powerful, so they were going faster, but I was able to completely stop combat. It makes for a powerful combination (at least for 3rd edtion- I don't think you have enough points to do anything like it in 4th edition)
-kv