It's a nice lens, but there are a few quirks with it. If focusing on something way out in the distance, waiting for it to get closer, sometimes the autofocus has a tendency to hunt. The AF servo is pretty noisy, but for my purposes, it doesn't matter. It's a great lens if you have plenty of light, which again, works well for me. For the cost, it is real tough to beat, about $300. I want the 80-400 VR lens, but that one is about $1,200, so that one will wait a while.