Nikon TC-20E III teleconverter

[sealhead]

I'm just about to order the new Nikon TC 2x III teleconverter based on the mostly good reveiws I've read scattered on the net. Basically it seems as good as the nikon 1.7 II with that bit extra zoom. I've uprgaded to full frame and really miss that extra zoom from the cropped sensor when shooting sports with my 70-200 f2.8. Has anyone used this teleconverter and your thoughts on it please?
Cheers, Tony

[mongo]

varies with the lens it is used on but generally very good.