Works great. The bare metal is a little easier to get in and out of a cage. The ones with color have a coating that make them a little stickier - which I've appreciated on bumpy gravel descents!
Tilt the bottle and a continuous stream of water is available. No squeezing, it just flows into your mouth making it easier to get a good swing of liquid. Bottles are easy to clean as well.
The best bottle Ive found so far