Excellent product by all means!! In terms of quality: both the build quality and the functionality are great! I have tested the adapter on my EOS-M50 with EF100-400L mark II and it works perfect: both the auto focus and image stabilization. The lens is a huge one compared to the camera body and still the adapter was able to drive both the AF and IS. I will give this a 10/10 - and for the price which is around 1/4 of the Canon original converter it worth every $. If I had to recommend Viltrox what to upgrade in the product it will be the following: 1) once the lens is mounted on the adapter - there is a minor movement (rotation) - it is not affecting the functionality but it could be slightly better. 2) the tripod mount on the adapter is detachable - if the manufacturer could make the same mechanism found in EF100-400L mark II it would be upgraded from 9.9 to perfect 10. 3) I would like to do a soft case / pouch for the adapter. Thus I could carry it easily in my bag.
It took more than 40 days to recieve it in Norway. Item as described .