My tailbone pain isn't all that serious and never rears its ugly head until I'm into the last few miles of an epic mountain bike ride. It hasn't been a problem since switched to the WTB Rocket V and similar WTB saddles on my more upright (mostly mountain) bikes. They have a big channel down the center and the rear of the saddle has a really deep V notch. Specialized and a few other manufacturers make similarly shaped saddles. I tend to have the opposite problem on my more aerodynamic bikes and use Selle Italia Prolink and Flite Gel Flow saddles with drop bars.