I am not a big proponent of reinventing the wheel. That's why I didn't get sucked into the hype about Camelbak's fancy new water bottle, especially with the gimmicky insulation layer. It's just another water bottle and I seem to have dozens floating around the house. I was however in the market for a nice stainless steel bottle for the LHT (yeah you know me) but I couldn't find one that performed well and wasn't insultingly expensive. Before I went on my trip, my wife got me a Podium ChillJacket for my birthday. So there I was, hype and gimmick in hand, and I freakin' loved it!
The water flows out with ease. It's nice not to have to use an extra breath to pull water out of the bottle especially when you're sucking wind to begin with. Like when using their hydration packs, I find I am drinking more water when I ride.
The other nice thing is that the Chilljacket works pretty well for such a thin membrane. If you put ice water in the bottle it will keep it cool for at least an hour or so on a hot day and that's better than nothing.
Buy it if your sick of opening and closing the valve on your bottle every time you drink only to get dripped on.
Don't buy it if you must have steel no matter what the cost.