Based upon one week of use, the lens is exactly what it should be: a fast focusing, reasonably sharp telephoto to super telephoto zoom. I've been using it for birds and wildlife, and it does a great job. It's not particularly fast (f/8 at most focal lengths), so there is no need to stop it down for best image quality as diffraction becomes the limiting factor. Matched up with the modern autofocus capabilities of the X-H2S or X-T5, it achieves a reasonable AF "hit" rate even on birds in flight. I have successfully tracked soaring bald eagles at 600mm and been very pleased with the images. If you want a moderately priced (for its capabilities) super tele zoom for the Fuji system, this is the obvious choice. It is lighter than its size suggests, and I love the fact that it's an internal zoom, even if that comes at the cost of some extra length when stored. Recommended.