I'm 5'7" 145lbs with modest legs (425lb 1RM Deadlift, 315lb 1RM Squat). Medium fit perfectly with comfortable space for ankles unlike some others. Little true compression to be had. But they fit snug and are good for leg day, hot yoga, running, etc.
Pros
Great product by a brand I’ve been purchasing a lot of. Perfect for under my Gi in jiu jitsu.
Cons
The waistband is too high or too low, causing discomfort during exercise