TITLE Boxing Gyro Balanced Leather Speed Bag - Professional Boxing Training Equipment for Home & Gym Use | Perfect for Boxing, MMA, Fitness & Cardio Workouts

I bought the medium size bag and have been using it daily for about 3 weeks. I do have boxing experience and usually would buy a small bag, but my kids and wife use it also so I went for the medium one rather than the small one. As far as the construction, there has been no quality issues. I pumped it up to 4.5 psi and it's holding up well. For a medium bag it's sufficiently fast. My 8 year old daughter and 10 year old son picked up on the speed quickly. If you're new and trying to decide between a medium and large, get the medium. The large is actually harder to learn on and is so much harder to get going quick. You'll wish for a smaller one after a couple of weeks. Only thing I find annoying about the bag is the lace seems to want to come undone. Had to re-tie it a couple of times. But other than that it's been great.btw..if you are brand new, pump it to 4 psi. Much easier. Difference between 4 psi and 5 psi is quite astounding. Lower psi is much more forgiving of slightly off center strikes. It's easier on your skin, and is a bit slower. It's also quieter and cause less vibration if noise is a factor where you train. At 5 psi, a slightly off center strike cause the bag to go in different directions. But once you get the hang of it, it's much faster.I use this pump Under Armour Dual Action Pump, Black and it works great.