Great lens for anyone just starting out
This is a great lens for anyone just starting out and wants a little more reach. In good light, this lens performs pretty well. The autofocus is not super fast, but for most tasks it will do fine. If you are looking for something to photograph portraits, kids playing and closer subjects in BRIGHT LIGHT, this lens is for you. If you are going to be shooting action sports, you aren't going to get professional quality shots.
Don't expect it to be great in low light though. In low light, the sharpness of the lens goes down, not to mention that you'll need to raise your ISO pretty high if you want to freeze the action.