Title: OK if you have no other options.
Product review: This is a "everything manual" lens. Difficult to maintain sharp focus, even at 500 mm and more so at 1000 mm using the 2X extender that comes with it. I no longer attempt to use it without a tripod.I think you will get much better results if you use a 2X extender on your 200 or 300 mm lens. That is where I would put my money as you would retain most or all automatic features of your present lenses. And, if you have a decent camera/lens combination, you can even crop for more reach.
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