Bought this lens Sunday, took a few pics in the afternoon and I'm very happy with it, I'm also buying the USB Dock to fix a bit the OS, just a bit shaky on the 400mm end. Anyway this lens is fantastic for the price! I don't like tripods, only for long exposures!
The photo bellow is taken handheld with my Nikon d7200 / 400mm / 1/3200 / ISO 200 with OS on. Pigeon was on the top of my building over 20m high. I cropped just a bit of the photo and of course this photo bellow is not an original, that was too big to upload.