I've only done one ride on my "properly sized" saddle, but so far I think it's probably worth it. Especially if you have wide sit bones, apparently most OEM saddles are pretty narrow. Like, 130mm in the Specialized world. I'd be on a 155mm according to their system, which translates to the M/L in Ergon. Also the fitting takes approximately 43 seconds to do if the shop as one of those ass-o-meters from Specialized.I've honestly considered getting properly measured for a saddle.