Amazingly warm and windblocking
I can't believe how well these tights cut through a headwind or frigid downhill. The windblocking/insulating ThermaShield extends up the front of the legs, across the crotch, and up the front of the bibs to provide more protection than most competitors. In fact, the bib front (which extends up to my solar plexus) includes a zipper for easier entry/exit, and I've found myself zipping it down during hard rides near freezing to keep from overheating my core. The legs breathe well, but I wouldn't wear these if I expected the temperature to rise above 45 degrees.
The fit is pretty tight. I'm 5'9", 150 lbs, 31" waist and the medium is a tight fit. I like them snug, but they require a some tugging to get on and I wouldn't want them any millimeter tighter.