I put the insulated hose on mine shortly after buying it and would not go back to uninsulated.
I'll have to play with mine some more. It
is insulated. The tubing comes from the pack body down the
inside of an insulated packstrap (never going outside), and then the tubing has an additional insulating sleeve around it to boot. It's made to be insulated from freezing, but insulation is insulation. I do not have that inner insulating sleeve slid all the way down to the bite valve, and maybe it's that last 5 or so inches of exposed tubing that's warming up on me. I'll try sliding that down. Alternately, I could pull the hose up so that only the bite valve sticks out of the packstrap, but then I might look funny turning my head to the side and sucking water from my armpit area! A little bit of tubing hanging out makes sipping more practical.
My other pack has an uninsulated setup where the tubing comes out near the packstrap attachment, and then follows the strap on the outside. I haven't noticed that setup getting any warmer than my other setup. It's only the first two sips, so the minor amount of warming is not a critical issue.