I took my first pair of tights out yesterday. They're cannondale midweight. They were plenty warm. The only downside is that they're slippery, so I kept sliding forward on the saddle. They are too thick to layer under my shorts (I had shorts on under them) unless I go buy more shorts and get a bigger size--would be too constricting particularly around the hip flexors. I did get used to them pretty quickly, and if I spent a fair amount of time in the drops, I didn't slide too much. FYI, I got one size smaller than I wear in their shorts.

I'm looking for some with chamois but I like to try stuff on and a lot of stores around here don't sell those but cater to the people who just want to layer with what they've got.

Another note: I have a fairly long inseam (32-33) and the XS/P size hit just above my ankle bones. I'm guessing they were around 29-30. The S were a little longer and the calves looser such that the zippers bunched a little. (I have skinny calves and the XS is a snug fit).