I puchased one a while back, but haven't had much time to use it. Soft around the edges at 200mm. Occasionally also the focus searches at 200mm. But for the price I can live with these things. I also picked up the Kenko 1.4 teleconverter and it works fine with it, if you where ever interested.In my gallery the pic with the mother bird feeding the baby bird was taken with it. If there is anything else I can help you out with, feel free to ask.
Michael