As such, the build quality is quite tidy and everything is made clean metal. The problem is, unfortunately, the construction itself, because the objective can only be tighten, but not locked, despite a spring-supported and movable metal nipple - either not fit the construction due to tolerances, or else it is a complete misconstruction. So you have to watch all the time that the lens is not removed by mistake when focusing or carrying around and produces an expensive shambles. Camera side, locked the adapter incidentally properly.
Conclusion: Misleading product description, solid manufacturing of metal, but at the end of a single risk factor in use.
At the end you should then probably just select the licensed, expensive brand product because then everything works at least (as I at least hope).
Addendum: After repeated placement of the lenses they raced at some point but, but produce previously seemingly abraded metal, which is very serious, especially in a mirrorless camera like the X-E1 or X Pro 1. While thus the criticism is weakened, that they. optics would not lock, the metal dust then is added, however, and is also the build quality a major question mark. The Unendlichfokus is indeed given, but something is wrong, the problem with the lack of aperture ring on EF optics is of course continue, as the adapter does not Abblendmöglichkeit and one should not forget that some EF lenses can be focused even without power supply (eg 85 /1.2 L)
Revised Conclusion: Still unclear description, solid manufacturing of metal with questionable tolerance and dimensional inaccuracy on the bayonet, no aperture ring, Unendlichfokus is next with this adapter. Does not change the rating.
