this is purely a gimmik in my eyes.
why take the worst inherrent design flaws and combine them into a drink container.
as someone allready said cans stack beter, and glass is smoth and cold on your lips, enhansing the smothness and coldness of any brew,
im a designer and most products are crap and its totaly the apperance and exsperiance they supply the user with that creates the impression,
if they were made out of gold though this could be a winner.
i could see them made out of highly polished stainless steal with the infomation etched into the bottle, and i thick rim on the top to hold the cold and give them something to polish up as smoth as glass, this could possibly work.