It works with my Sigma 50mm f1.4 (full frame lens).
It is basically useless with my Tamron 17-50 f2.8 (crop lens; focal distance too short; with tubes, can not focus any more, as focal plane behind the sensor).
It provides problems with my EF 70-200 f2.8.
Any one tube is ok.
Any tube tubes sometimes cause "ERR" or display or "aperture 00" indication, and no aperture setting possible.
Three tube mostly give error as above, and only sometimes work.
But when it works, you get great results. Tagotech offer me exchange, but I decided to keep nevertheless (they offered me some discount for that).
I recommended to Tagotech to change the description and include the error description or a caution text.
Looking at the tube contacts, one side is perfectly built, polished, and with gold plating.
The other side of the contacts is just cut metal, rough (not polished), and not gold plated.
I intend to try to polish the other side, I hope that this will improve the intermittent issues.
I'm also experimenting with another method: reverse coupling ring to mount two lenses (the front lens in reverse). This gives extreme magnification and so far great results, but extreme shallow DOF. Tubes are slightly better in DOF, but less magnification. I use two "Tianya filter adapter ring" glued together with superglue as reverse coupling ring. Cheap and works great!!!
If I got some time (rare), I intend to take different pictures of the same thing using the two different methods and then post it in the forum. Too bad so busy...