Let me start out saying: If you drink alot or a little, please, DO YOURSELF A FAVOR and buy a breathalyzer.
I have an Interlock system on my car...some call it a "blow & go". I'm 22 months into 24 months (2 years) of being required to drive only this car and having to blow & go every time I want to start this car. If I'm stopped driving any other car even if I'm sober as a judge (ha ha) I'm going to jail for a minimum 6 months, because my license suspension is DUI related.
Every 2 months I have to go into the State regulated Interlock garage and have the system downloaded and reset. One of the rules are that if you try to start your car and blow a BAC reading over 0.025 the car won't start and the system registers demerit violations. Two, 3 or 4 demerits depending on how high your BAC reads when trying to start your car.
If you register 12 demerit violations during the entire time the system is on your car (in my case 24 months) the system is removed and you're removed from the program.
I only have experience with the AL 7000 and the accuracy is absolutly perfect.
I had a beer while doing some computer work at home. A while later my wife said "I need to leave in a couple minutes". I totally forgot my wife was going to need a ride to work cause her car was in the shop. Before trying to start the car I used my AL 7000 breathalyzer and registered just over my 0.025. I drank water, waited a little while and tried again. My 7000 registered exactly 0.025. That's the minimum reading you can register on my Interlock system and be allowed to start the car.
I went directly to the car (maybe 45 to 60 seconds later) and blew into the blow & go and my car started. Believe me, the 7000 must have been accurate because my Interlock system would not have released the ignition unless I blew 0.025 or less. My wife was a little late for work but I saved myself demerit violations and possible removal from the State's Interlock program.
I've been using this 7000 for almost the whole 22 months I've been on the State's Ignition Interlock Program and the reason I'm only on this site today is to order a new sensor. I thought I really should write a review because I'm so impressed with this anaylzer. I plan on keeping the analyzer handy even after I complete this Interlock program.
I refuse to get another DUI and I'll feel certain about my BAC levels before driving, even without the "Blow & Go" locked to my ignition.