These Elite bottle cages are great. I have lost too many water bottles out on the trail with the standard steel cages. Even when bent in for maximum grippage, bottles still seemed to weasel out on a bumpy descent. The Elites hold onto my 25oz Podium Big chills and dont let go. Perhaps not the best value on cages made of plastic and rubber, but if you can find them on sale, these are worth consideration.
I went for the plastic over carbon based on cost - the price premium for the latter seeming too high to justify. At first, these bottle cages were so stiff that I found them almost unusable on my road bike, but with a couple of months' use, they have loosened to close to 'just right'. The are light weight, low cost, look ok, certainly do a good job of firmly gripping, and seem durable. The fit with my insulated bottles (podium) is imperfect, but not terrible. Fits ordinary bottles just fine.
FWIW, the apparent loosening is real, not just perception. The 2d bottle cage, which holds my seldom used backup water bottle, is as stiff as ever, while the primary one has eased up.
These are simple plastic cages. They are reasonably lightweight and look good. They grab the bottle snugly and that's good if you're using these for MTB, riding gravel or on bumpy roads. You can spend a lot more on a bottle cage but you won't get any better functionality than these provide. The snug fit could be an issue if you are challenged at quick bottle removal and replacement but it's not a big deal.
Holds bottles very securely. However, if you're using Camelbak Podium bottles, they can be difficult to get in and out of the cages because of their shape. Stick with straight-sided bottles for best results.
I know it's not as fancy as some of the carbon cages out there, but it's still super light and I've never lost a bottle. The price is right too, and if it's good enough for the pros it's good enough for me.