I bike daily and average about 5000 miles annually, in the winter, I bike about 750 - 1000 miles even in the cold.
The solano tight is well designed to protect the front of the legs whilst letting moisture out the back. The knee is a bit stiff to articulate, but after riding a bit it feels okay. Off the bike, I feel a bit restricted in terms of movement, but perhaps that is size-related.
I previously used my other tights (not cycling tights) which were meant to be worn underneath as a base layer and those provided no wind protection so my knees (and legs) would be cool (not to be crude, but some external parts would be cold, especially when riding down to 10' F). The tight is a huge improvement over those tights (referencing earlier comment, no uncomfortable coldness in sensitive areas). Now that my legs are warm, the next thing I need to improve is my hands and feet.
I get out of the tight carefully to avoid stretching it around the ankles and it also turns it inside out which lets it dry better. A zipper would be nice to make that easier, but if you need to dry the tight anyways, just get out of it carefully and slowly.
I have only worn this one season and so far they seem durable and well made. I hope to get many seasons from this tight.
In terms of sizing:
I am 150 lb and 5'9" and am wearing the small tight. The small fits, but I think I am at the limit of the small, I think the medium would fit better. I am happy to have purchased the Solano tight to keep myself warm in the winter.
Happy with these tights especially for the price I paid. Nice pocket that can keep a smaller phone on the side, thick fabric that's also pretty windproof. I've taken it for rides in the 30s and 40s with some wet mist and been very comfortable. Layers well over chamois shorts. Makes it possible for me to go out on the bright cooler days and got me home the one ride when it got wet on the second half.
These are very warm but wick away moisture! The only problem is that they seem just a touch stiff making them very slightly harder to pedal. Worth it though if it's cold out.