Can we distinguish high quality hydraulic soft close hinge from the one with bad quality via intuition？

Yesterday, I met a boss whom I’ve known him since 2001 and we’ve done business for four or five years.
He was so happy to meet me at the gate of his factory as soon as I got off the car. “Glad to see you again,Kingwen”, He said.
“Yeah, long time no see”, I answered him with a smile. After 2006, we have not seen each other nearly for 6 years, due to the fact that clients demanded much higher level products，so that they changed hinge supplier.
After greetings and knowing recent situation between us, he showed me our kav brand soft close hinge and said “The soft close function is a little fast. It seems that the hinges we use now are better. Is the buffering effect not enough? It is better that the door can soft close at angle of 30 degree and will not produce noise.
“It does not matter, and we can adjust its speed as long as you put forward your demands. I am here now, and we can solve all problems right away. Or if you have any new requirements, extra function or new design, maybe I can help you out.  Also you can ask a technologist to install this soft close hinge with me and compare it with your previous ones and which one is better can be found out soon” I said. They readily agreed, after finishing installation, he looked at it and said the effect is almost the same.
Moreover, when he pulled the door at 35°Angle and then loosened his hands, the soft close hinge they used before didn’t have the function of buffering and made a big noise, while our kav brand soft close hinge soft closed with great buffering function and without any noise.
Now customer is very satisfied with our soft closing hinge, and he knew some of his friends also have been using our concealed hinges for years. He suggested that he will place order for our soft close hydraulic hinge and soft close slide in a few days.

So, here underline again by Kingwen, I already uploaded lots of articles about how to distinguish hinges. Currently, with the increasing requirement of customers and development of domestic soft close hinges technology, it is difficult to distinguish soft close hinge of bad quality from the one with good quality, if only with our eyes and several close-open movement. We have to try to use them and as the time goes by， there will show up the differences.

What do you think?

Remark: It is forbidden to edit, modify or reprint without special permission by Kingwen, or one should take responsibility for any loss.