Very good product for this price

In principle, the adapter is very good, the picture quality is "Apple-quality", ie first class! The 1-point deduction from me is only because I have noticed that the stability of the connection is "sensitive". Once the connection has been produced, it is working properly, but it can happen, that it's right after plugging into the Thunderbolt / Mini DisplayPort a little lasts until the connection is stable and should the Macbook not etc. move too much during operation, since it sometimes can cause blackouts otherwise.
But again, if the connection is established and you do not move the computer to violently back and forth, this adapter provides a "High Quality" picture without the least interference for a real cool price. Therefore, highly recommended!