I have only used this bottle cage a couple of times but it seems to hold my bottles pretty securely.
My bike frame is size Small and I use a 20 or 24 oz bottle so having the side release is helpful.
Buy once is my motto. Bought these for my gravel bike for Bikepacking trips. The frame bag made it hard to access the bottles with a top loading cage. This was the perfect solution. I liked these bottle cages so much I got a set in Matt black for my new Canyon Ultimate road bike. I find the side loading cages easier to use. This will probably be my new go to cage for all my bikes. Like I said expensive but worth it.