I have one on my bicycle it’s a great idea but there case is bulky I have thought of getting it for my motorcycle
I use this.
Techmount 4-Techgripper - Universal Cell Phone, GPS and MP3 Gripper https://www.amazon.com/dp/B00M063RC0/ref=cm_sw_r_cp_apa_IBJkAbXPRRCAH
Works great.

For some reason this design seems like it won't be reliable (as in the phone might just slip off.) but the reviews are crazy good. What sorcery is this.![]()
You mean the Ram Mount scissors sort of thing with 4 posts?
I wondered the same thing but then Googled "quad-lock phone mount." It's not the same thing.
I have no experience with the quad-lock but there is a RAM product that I like much better than the X mount: https://www.amazon.com/gp/product/B0088LL7UA/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1
This thing is very secure and putting the phone in is extremely quick. It's not a thing of beauty however.
You mean the Ram Mount scissors sort of thing with 4 posts?
https://www.rammount.com/products/x-grip
If so, it's a good mount, even if you buy a new phone, since they are somewhat flexible. I know they work ok with Samsung S7, Iphone6, Moto-X.....
So anything in that general size range.
In the 10 years or so I have using these , in my cars, motorcycles, and even bicycle, never lost a phone, or even close.

I wondered the same thing but then Googled "quad-lock phone mount." It's not the same thing.
I have no experience with the quad-lock but there is a RAM product that I like much better than the X mount: https://www.amazon.com/gp/product/B0088LL7UA/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1
This thing is very secure and putting the phone in is extremely quick. It's not a thing of beauty however.