Boby Womac, Gryff Reec (from the superfurrie animals) and jimi (form the doves with a bass) all do that..
It's really wierd though when you first try it the other way, it feel like your starting all over again, and it boosts your ego (which is good when your not very confident like myself) as you reilize you've come a long way..
I recomend trying... it also makes you light on your toes, and for some reason you get to know the frett board better... but that really for beginers and not pros like your self..