I just got mine four days ago. I love it already. I don't understand the review saying it was bad, must have been a lemon lens. Mine is tack sharp. I wish that the lens kit (150-600 S lens + 1.4 TC) would have come with the usb dock. It seems a little me to not include that accessory with a $2,000.00 lens. If I had the money I would buy the Nikon prime lens in 500 or 600mm, but I don't have that kind of discretionary income. I am very happy with this lens so far. If you look at my gallery the only photo in there so far was taken with this lens at full extension with the TC. The camera body is a Nikon D810, on a tripod with a gimbal head.