My brother picked up a gross of the PP narrow mouth bottles for 20 bucks at a yard sale! He sold them off to friends for a buck a piece! Made his money back and more.

I have never had an issue with the lexan bottles. They take a major beating. I have dropped mine off of many cliffs and it never breaks.

As to the Go Cup, I am not impressed. I have one and I would rather use a wide mouth bottle with a Sipper . The main thing I don't like is that the Go Cup does not seal. Now if you get a replacement cap and a sipper then it may work better. (Just thought of that and now I will try it <img src="/images/graemlins/smile.gif" alt="" /> ) The thread is the same.