This is classified as a Level III, large, speed bag. It is fast and for the novice could be frustrating. I had it for (2) two weeks now and for its intended purpose is great. The bag is constructed well, rebounds true and holds air. The bag's bladder holds about 4lbs. of air (hand pump only) and found that a moisten valve and needle inserted only to the point of fill-up helps leaking. It can get loud even with dampening measures taken. Like any speed bag, it will improve your timing, reflects and give your upper body (arms) a workout. So far I am very pleased with the product, the cost and meets my expectations.