Works well enough for me.
Note: they can leak a tiny bit.
I put one in my frame/holder and another into my backpack - typically a small amount (just a few drops) leaks during the first hour (about how long the first bottle lasts me).
So, don't put it into the same pack with moisture sensitive electronics (cell phone, camera) unless you put the gadget into a ziplock bag - which you should do anyhow in case you fall into a stream.
What do you say about this? This is a plastic bottle. Mine says it's manufactured by Specialized on the bottom. Fits in standard cage. Threads work well and hold the cap on tightly. Just like all other plastic bottles, the spout in the cap will eventually wear out from my teeth and the threads will messed up by road/trail grit. Then I'll get another one. Yep.