I use it for my 12 year old daughter who wakeboards at a rather slow speed, 16 mph, with no ballast. Dropping it about 35% helps clean up the wake a little farther back at this speed. Also for the reasons mentioned above, mainly to make taking heavy chop a little easier when cruising. This is on a 2010 X-15. If the center tab is down even the slightest when my son is boarding he says it ruins the wake; I have not made that mistake while I'm boarding.