The handheld Sprint bottle (let me start by saying that I hate carrying a handheld bottle) is actually very comfortable to carry. And includes an ID card you can fill out with emergency contact information. On one of my family trail runs at Mammoth Cave I carried the Sprint for over an hour on this run. Ordinarily, if I am forced to carry something in my hand, I swap it back and forth between hands pretty regularly, but on this run I was holding the dog's leash in one hand and the water bottle in the other so it stayed in my hand until I emptied it, then I stowed it in the dog's pack.
The plastic of the bottle, the shape of the bottle, and the material in the handstrap were obviously well planned and designed. I had this in my hand for over an hour and for the most part I was able to forget I was carrying it. There was no rubbing, chafing, no hotspots on my hand. I never experienced any sliding or slipping of my grip. The strap is quickly and easily adjusted for fit via a hook and loop fastener. My biggest requirement for carrying a water bottle (other than it has to hold water) is that I need to not be troubled with it. This bottle's design was perfect in that regard. The only adjustment I made on the run was I took it off when I was finished with it. If I had not had Jack along I would have just left it in my hand and forgotten about it.\
So, the nitty gritty.
Lightweight bottle (it gets lighter as you drink!)
Comfortable in the hand.
No rubbing or chafing.
Well, I guess the only con is you do have to carry it.