Я получил его прошлой ночью и решил попробовать его сегодня из-за неоднозначных отзывов о нем, особенно тех, что говорят, что это DOA В целом я доволен with this. I would actually give 3.5 stars if I could. I'll start with dislike because that's what a lot of people seem to want to know about it. 1) Cost ($58.99) for what it is. 2) This matches #1, the gauge read 5psi on the first tire, then 2.5psi on the other 3 (they were all high). Set it to 35psi and when I checked it with a hand gauge it showed 40psi. So I played the game and set it to 30psi and then checked and it was 32.5psi so I changed it back to 32.5psi (set value) and checked again on the next tire and it was 35psi. Did a fourth tire at 32.5psi which was 35psi what my tire required. I took a break and came back 30 minutes later and tried it this time on my car (just one tire) set at 32.5psi and when it was done checked it and it was 35psi. 3) 2 plugs didn't want to stay together. Let me go back for a minute, I hooked it up to the battery as you suggested. I solved this problem with 2 cable ties. Now for the positives; 1) It's easy to use and loves to shut down quickly. 2) Rapid inflation of tires. I lowered the tire pressure to 20psi. It took about 2 minutes to get each to 35psi on my full size SUV. On my machine I did the same thing and it only took about a minute if it takes that long. 3) Quiet. 4) It doesn't move like many air compressors. He stayed in the same spot the entire time he ran. 5) Digital pressure gauge is easy to see and set the cut-off pressure. I will update my review on this over time as my opinion on this changes. If the gauge reads correctly and the spark plugs stay together I would probably give it a 5 star rating; because it would work as it should and I wouldn't have a problem with the price. But twins are by far the best option. This makes it much quieter and faster.