Bottles are fine, look aero and they pop in easily and seem secure...
Mouth piece is cheap plastic though, so if you now only used to using nice spongy mouth pieces then you won't like these too much
But one cage? Pointless having 2 bottles then!
I bought one of these cages and it hold my bottles securely without rattles, It just works really well so I bought another ( enough said).
I admittedly only use this on my road bike but I would happily use it on my mountain bike
One of the best bottle cages I have ever owned! Entry is easy and it has a confidence inspiring 'notch action' so you know that the bottle is in. The carbon wings are springy holding the bottle well and its never failed me yet. I race XC so I need a bottle cage that works, you see so many stray bottles on the floor when racing - none of them are mine ;). Racing flowy courses to gnarly drops, steps