I rode 15 and -15, dead center, 156cm board for 10 years. riding feels exactly the same regular and switch. Also gives the rider more balance for jibbing and rails. I think shaun white rides 15-15 as well and look what he can do! But my days of 25 foot rainbow rails are over. I'm riding 50/53 on my prior and 45/48 on my tanker.