I bought this for my boyfriend - him and his friends were excited to use it last night, but we found out that you have to wait 30 minutes from your last drink for it to register properly. That makes sense, but, as they said, who wants to put their drink down for 30 minutes to test it out? I was the guinea pig since I was sober and it actually did read as sober. It's a fun little gadget that could come in handy - if the user has the patience to wait 30 minutes :) (Posted on 12/15/09)