I've enjoyed 191 several times and have a couple of remarks to add to Beemerdons'.
First, if you have time, try to spend a night at the Hannigan's Meadow Lodge. It's about halfway between Clifton and Alpine. No TV, and only the front desk has a phone. You can get wireless internet, if you insist, but better to just enjoy the quiet. Good food in the restaurant. You'll probably need a reservation, but wife and I snagged a room about three o'clock one afternoon last July without one. It was the last one available. (Also, a guy from England couldn't get his credit card to work there, so better have cash on hand. Mine worked.)
Next, several times I have very intentionally reminded myself to keep it cool when entering the numerous twisties on that road, and several times I have had to cross over into the oncoming lane because I underestimated the curve. Embarrassing, but there it is. There are usually cinders in the center line of the road, making matters worse. Our cinders are like ice. If you skid on them, especially with a lean on, you are probably going down. Fortunately, nobody has yet been coming the other way.
All in all, a great route to ride, and one I'll keep riding again and again. Oh, and the ride on the NM side is no slouch, either.
Just Sayin', WBill