The push-button activation is much better at allowing the air to escape at full volume as opposed to the ball valve method. Well worth the money if you routinely work with tires.
I am still impressed. My husband was able to change out our tires himself by having this in the garage.
1st time using was unaware of this but quickly figured it out. When using this be sure to have air being supplied to the tire before releasing the blast. The blast will push the tires to the bead but may not hold long enough to grab airhose and start filling.
I have used this at least 6 times....maybe 8. It has worked every time.