I think there's really no choice at all if you're using relatively modern lenses. The Kenko set is the only one that combines reasonable build quality with electrical pass-through. The latter is required for any G lens to work, since G lenses communicate aperture electronically. If you try to use tubes without pass-through with a G lens, you end up stuck at minimum aperture (f/32 on most macro lenses), hardly an appropriate choice. I have seen a very inexpensive Asian set with pass-through, but that particular set (or perhaps those just that particular sample) was very poorly constructed.
If you are pretty sure you'll never use these modern lenses and can stick to older lenses with aperture rings, such as the older 105/f2.8 AFD Micro-Nikkor or 200/f4 AFD Micro-Nikkor (or even older AI/AIS manual focus versions), then there is a much wider field available. I have mostly such older lenses, and I use the Nikon tubes that were offered in the 1960s and 1970s. They are built like the pyramids, and there is a wide range of sizes - but they are useless with G lenses.
Now that I am starting to get G macro lenses (the 60/f2.8 AFS Micro-Nikkor), I have considered buying a cheap set and grafting the electronics from it into my Nikon tubes. I haven't done anything about that thought yet, though.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!
Question I was digging around in my "old stuff" Nikon draw and came apon Nikon PK tubes they are auto but not sure if AI "auto extion ring PK-13" and "PK-11A" Can I use with out worry on my D800,D3s or on my D7100 Thanks all
Jeff "See it - shoot it - for tomorrow the light will have changed"
Both the PK-13 and PK-11A tubes are AI compatible and can be used safely with any of the cameras you name.
They are "dumb" tubes, without any electronics at all. This means that they can only be reasonably used with lenses which have aperture rings, and even then functionality is reduced to that of any other manual focus AI lens. (A and M modes only, metering limitations, must use the aperture ring to set aperture, etc).
"There is no real magic in photography, just the sloppy intersection of physics and art." — Kirk Tuck