I bought this pump about a month ago. The cheesy plastic pump that originally came with my stability ball finally broke, and I needed a replacement. With the original pump, it took me a good 20-30 minutes to fully inflate it from scratch. While I haven't had to do that yet with this pump, I can tell you that the double-action pump (inflating on BOTH the up- and down- strokes) makes quick work of filling your Ball. It is very easy to set up and use. I highly recommend it.