the discretion that one-hitters give is just great. i used to work at a very busy shopping center/strip mall and i would always step outside and toke a little when the customers were pissing me off...glass is definitely preferable to metal, but i also have one of those little cheesy cigarette ones and it IS perfect. i mean, it won't do when a bowl will, but for a quick litlte smoke at work or school...there's nothing better. i bought this really awesome one made of rainforest glass or something that was awesome. i also saw one with a HUGE bowl and a carb...just seemed a lil impractical.