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Agreed with Ian statements. It is a very sharp but heavy lens and it accepts very well all TCs, including the TC20EIII. A fact often overlooked is that in the optical formula there are 4 ED elements, not just 3 as the newer designs.
Other thing is that my lens repair technician has stated that AF-I motors are far easier to repair (with non original parts) than AF-S ones, which are totally dependent on Nikon original parts. That is not the case for the coreless AF-I motor, which though a little bit noisy, are as fast as AF-S motors. Don't ask me how, I am not an expert, I am just telling what this repair guy told me.
The fact is that I have this lens and a 600/4 AF-S II, and the only one failed motor until today was: the newer AF-S!!!
Some samples with TC20EIII and TC 17E:
Ardea alba by labecoaves, on Flickr
D3 + Nikkor 400mm f/2.8 AF-I + TC20EIII [=800 f/5.6 af], tripod, gimbal head, ISO 320, 1/400s, f/11(5.6), ~ 33% crop of an already cropped D3 5:4 crop mode.
Melanerpes candidus by labecoaves, on Flickr
D3 + 400mm f/2.8 AF-I + TC20EIII = 800mm f/5.6 @ f/11, 1/640s ISO 400, Tripod + gimbal head. ~ 40% cropped, > 20m distance.
_TRZ8647 400mm af-i+TC17E by labecoaves, on Flickr
400mm f/2.8 AF-I. ~ 50% cropped. This old and heavy (6.5kg!!) telephoto works very well with teleconverters. The combo here is an effective 680mm f/4.7.
400mm af-i + TC20EIII = 800mm f/5.6 AF by labecoaves, on Flickr
D3 + 400mm f/2.8 AF-I. ~ 25% cropped This old and heavy (6.5kg!!) telephoto works very well with teleconverters. The combo here is an effective 800mm f/5.6.
and this last one with the TC17E:
http://ibc.lynxeds.com/photo/cock-tailed-tyrant-alectrurus-tricolor/male-cock-tailed-tyrant-perched-grass-campo-limpo-grass (click on the image to see a higher resolution version)
I think this is not bad for an old, "garbage and outdated" lens, though this is the only Nikkor 400mm with 4 ED elements, newer or older models have 3 or 2 elements only (source: nikonlinks).