The strength and yoga and 4DP focus are really the draw - the plans are merely adequate. But there is good content, fun rides, and even some skills/drills.
Trainerroad has leaped ahead of everyone with the adaptive training and progression tracking, in my opinion. Not to mention outdoor rides (Wahoo will add that by the spring, it seems). Wahoo must be concerned - SYSTM is a nice new framework for their fun and flashy content, but they lack the AI brains and progress/feedback that adaptive training seems to provide. Trainerroad seems to stand alone in what they can now provide for high level athletes.