Oh no! I hope you can get it resolved. You saw my (horrible quality) youtube video showing the first copy I had of the lens, right? Where the focus just slipped and slipped? http://www.youtube.com/watch?v=egiOz8xoP74
Hopefully my 2nd copy continues to work reliably! If something dies on it, it'd definitely be getting sent in for repair though, it's so sharp and happy I wouldn't want to part with it... Friend swears up and down after looking at some full sized samples, that it's better with the 2x than the nikon 300 2.8 VR is with the 2x TC III. I still am skeptical, but he's very adamant that it's true, lol. Whatever it is, its' very good with the 2x on. Here's a 100% crop at 600mm...f6.3, too, not f/8 or anything! And, it's a 100% crop from a D800 , at that...
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No, it's not a 600mm prime, but it has DAMN GOOD sharpness at 600mm.