Not worth much
Jason B.: 
While I've never used the normal tube, I find every first mouthful hot. Maybe this thing is more suited to cold weather use; i.e. not freezing. Once you clear the tube the ice you filled your pack with before putting in water has the water ice cold all day, while still melting quickly enough to never run out of water. I work in ninety+ weather, so it may be that I'm expecting too much. But for twenty bucks I wish that I had bought a cleaning kit instead.
Not Worth It
wes1418650: 
I bought this as an unbottle, as my old 70 ounce reservoir constantly left a nasty plastic taste. I bought into the marketing hype of the new gear in hopes that they told the truth. Well, perhaps the reservoir itself doesn't emit any plastic taste, but I think this tube kit does. I need to swap the tube with the uninsulated tube to find out for sure. But, besides this, the tube came undone from the reservoir (I had it pushed as far as it could go, just like the stock tube). Thankfully this happened in the house after my outing. But, I was not pleased to get a sudden burst of water everywhere. And, as far as its insulation qualities...while it probably did help some, every sip I took started out with a nice rush of warm/hot water. And, the rubber/plastic cap was very cumbersome to use. As mentioned earlier, it will not fit through CamelBak's shoulder "loops". You would have to feed the tube through the loop first, then attach it to the reservoir, then fill it. That's not convenient if you like to freeze some water overnight first. For me, it's not worth the $16. Use that money towards a cleaning kit.
Works good, one flaw
Don M.: 
Does what it should, my water didn't freeze up, also keeps the first gulp nice and cool in the summer. My only gripe is that the valve cap is so big, it takes me forever to force it through on 2 of my packs. Makes it difficult to easily move my bladder from pack to pack.
not reliable
Dgulle2193871:
halfway thru an intense hike the bite valve came apart and water everywhere,mostly on me not a great thing when its 40 degrees. I survived the hydration bottle didnt. will look for other type.
Keeping the water flowing
RPdub: 
I just got this Thermal Control Kit, and I am stoked with the results! I have had no problems with my water freezing up in the very cold temperatures, as long as I blow the water back into the CamelBak bladder when I am done drinking. As long as you remember to do this, you'll be good to go!
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