Well I think you can use NEO 2 as dumb trainer without power source as a dumb trainer. But reviews mentioned that putting it away is kind of a PITA. Out of two I would go with Kickr 2. It has a handle, it doesn't slip like NEO 2 during hard and sudden accelerations. Neo has the "road feel" vibration thing when you are using it with zwift, but it sounds very gimicky.