There are definite pros and cons:
Cons:
Edited to add: de in DC has a serious one to add, the plastic reservoir of this bottle is type "7" which is the kind under scrutiny due to preliminary findings that "7" contains Bisphenol, a chemical which has been identified as being a possible carcinogen.
It's heavy. It's even heavier when you fill it with water.
In order to sip water from the bottle, you have to bite down on a silicon stem and suck. Not only is this uncomfortable on my teeth, it just feels too much like I am sucking on a sippy cup.
Having spent a lot of time in New England, it occurred to me the silicon stem of the bottle is far too reminiscent of the neck of a steamer. Again, something I found to be disconcerting if not flat out creepy.
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Pros:
It is very easy to program.
The digital display is clear. Buttons are easy to figure out.
Program your weight into the bottle and it will give you a recommendation of how many ounces of water you should be drinking to be properly hydrated. (Although one of the guys at the gym commented "What if it's a really hot day? How will it know?" Is it a valid point? I have no idea because I'm too busy hydrating myself and peeing like a racehorse as a result.)
Keeps track of how much you have had to drink, in ounces or in metric.
Pros and Cons aside. My biggest problem is I kept forgetting where I put the thing. Not the bottle's fault. It's all on me. At one point as we were getting ready to go from point A to Point B, Sarah asked, "Hey, you want this?" and I responded, "Want what?" (Picture Sarah dangling the hydracoach by it's handle thingy and looking at me hard.)
Can I recommend this gadget? Not for the price. If it were 10 bucks I think it would be a better investment.