Had it switched for few months last year. Was typing slower, but started to ramp up the speed with daily exercises.
Main problem was switching back and forth when using different computers (and uni, and back home, and such) which was mentally painful. So, I had to switch back.
Even worse was when I tried forcing myself to use my right hand (I am all-leftie), using mouse extensively with my right for extended time (like, Diablo 2 sessions) actually caused headaches.