Thanks Jeff. Yes, the 21" is self propelled, 5 speed. If you like your js63's, you'd love the jx75. The 6hp kawasaki engine is great. It has .75hp less then your engine, but it probably has more torque and feels more powerful. Blade clutch is also a plus...if there is a stick or some trash in the way, all you have to do islet go, pick it up, and keep mowing. Don't have to restart it. Also nice if you bag a lot.