It took me quite some time to learn to type somewhat fast with the QWERTY keyboard and I think getting older doesn't make me any faster in learning to type fast with with another key setup, so I think I'll go with what I got.
Any speed gain I would end up getting would probably be negated by the amount of time I would type insanely slow with the new system at first.
Would like to try one though but haven't ever even seen one of those live.