I always carry mine in the car. It is great to have it handy in case of doubt if your body took care of methabolize the alcohol in your bloodstream. It is important to respect the 20 min time after the last drink to have more accurate and repeatable values.
Very little use of the product yet. I am not a big drinker but am a homebrewer and belong to a local brew club. Purchased as a reminder to be responsible in my drinking and to regularly check alcohol level at different events.
The breathalizer is ideal for keeping in the car for those"impromptu" dirnks or when going out for lunch or in the evening - makes you feel more comfortable about being able to have a drink and to be able to drive safe.
I attend a great many Black Tie Parties... it's necessary to leave the Parties knowing I'm NOT a candidate for DUI, I need to get a room or sleep it off in the car. These 2 Units are both VERY Accurate. Bought the Element for a newly single friend and the S80 for myself. After I bought mine, MANY of my friends have also followed suit and bought one. Who wants to get a DUI... (I know I don't have $12k to throw away on something that coulda been avoided), it's helped considerably!
I bought this for personal use because I was tired of the cheaper ones having unreliable results. I think it has reliable results which is the most important. It is relatively small and convenient. It shows the number of uses before each use (so you know when you have to recalibrate it) but it flashes so quickly it is tough to read. Since it takes about 15-20 seconds to warm up...it could show the number of times it has been used longer. I wish it costs less but you get what you pay for...this one has been consistent on results when we've used it to retest.