I bought my first device 3 years ago. Since then I have ordered 2 more times and given them out as gifts. The parties that received the devices liked them very much and said they were very easy to use. I'll be ordering again in the near future and would recommend this device to my friends.
I've had my S80 for about a week and am testing it out on myself and friends. The readings are way off base. After 1 drink it read 0.77 and have never gotten a reading of 0.02 and up. It always displays a 2 digit number. I'm ready to send it back - I don't feel I can trust it.
We use this everywhere we go when we drink. It is very accurate. Several times when we were borderline we caught a cab anyway. It truly saves lives and tickets. I had an old different brand breathalyzer and is no comparison to this. I am giving it as gifts.
2nd S80. Like the product but quit giving accurate results after about 10 uses. Sending it in to be recalibrated. Very low readings, even 0.00 after a couple shots.