Absolutely amazing. Got lucky and came on a perfect sunny day, a little cold in the morning and especially up top. Drove around some places before we headed up the mountain and got some very interesting facts (and dad jokes, depending on who your tour guide is). I'm not going to spoil any of the fun but just do it, take in the scenery. It's not always you get to ride a bike down the same highway races are held, not to mention from 14k ft.. Just be sure to breath, as the oxygen is very low.