Hi, I received my case Tech21 and I can tell you that it is superb. The grip is very good the contours of this case are all simply sublime. At first I wanted to take the rhinoshield and I changed my mind because it is too thick compared to the Tech21 and the slider button on the shell I do not like at all. This one is quite fine with a unique design and a nice opaque transparency which makes it even more attractive. we have a good impression when we hold the oneplus 6 with. I wanted something other than TPU and I was looking for a shell shock i does not regret my purchase. I will post photos for those interested.
There is a review on youtube
https://www.youtube.com/watch?v=DlwWclX8zs0
There is a review on youtube
https://www.youtube.com/watch?v=DlwWclX8zs0