My well-traveled plastic water bottles were getting funky and stiff and raggedy. Having upgraded to new aluminum bottles, I quickly learned that my existing metal bottle cages weren't going to make it.
These are awesome. Just as I'd hoped, the metal bottle slides easily into these plastic cages. Doing the job. And I've not noticed any slippage on some fairly rough roads, so I'm confident.
I use it on my Langma with a Camelback Podium and it looks sleek and so far, holds the bottle securely. It still lets me grab and replace my bottle with ease.