I agree Roy,they dont work well on all lenses but I have had some cracking pics with both my ef 75-300 and my sigma 135-400.The attached pics were taken with the sigma and the kenko pro 1.4x TC.The redstart is quite a heavy crop and needed some work in photoshop as it was overexposed by 1 stop (dont ask!) and was washed out.I have a few examples when using the 75-300 and the cheaper kenko 1.5x TC on my birdforum gallery.I would have downloaded some off there and attached them here but it is offline at the moment.
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