Get what you pay for.
Bought this to adapt for my leica-r to a7ii. It works fine. Built quality is good.What don't like is that its not a tight/snug fit. There is a little bit of wiggle when it's attached to lens and then body. I also have a metabone adapter and it fits perfectly with no play. Then again you have paid $$$ for the metabone. You get what you pay for. Works fine if you don't mine the wiggle/wobble.