I have personally been in the medium/heavy duty vehicle repair industry for twenty years now. Throughout the years, jump starting a vehicle is a way of life, especially in Indiana winters. I am used to being let down by the performance and reliability of handheld sized jump starters. Fed up with wasted money, and unreliable products, I searched the infamous internet. I came across richardson jumpstaters, which I had never heard of before. There were several vehicle mounted style jumpstarters on the website, but that was not  what I was looking for. On a whim, I sent an email to Richardson asking for help/information. I was contacted quickly, and was introduced to the JB12HD jump starter. At the time, it had just reached the end of its "trial" phase, and was about to be released to the public. I was educated on the unit, and they even offered to let me demo the unit with no obligation. We have a school bus fleet of 130 vehicles with engines from 6.0 GM gasoline to 7.7L Detroit Diesels. The first vehicle I attempted to jump start was actually a 1964 John Deere 4020 with a diesel. It was below zero and the engine was ambient air temperature. The batteries in the tractor were also completely dead. Once hooking up the JB12HD, we attempted to turn the engine over. Honestly, it spun over like a summer day with fully charged batteries.. I was blown away! We had a new NOCO jump starter that allegedly would jump up to 10L diesel engines. It would not produce more than a click from this tractor. The difference was night and day between the products. I have personally jump started more than 20 diesel buses in a row on days well below zero on a single battery charge. The battery life and performance of this product has spoiled me, and I have not found a comparable product. We are three years in with this unit, and it has never failed to start anything I have put it on, in any condition. I ordered another unit to keep on my service truck as well. If you're tired of paying for products that flatly do not work, spend the money and get used to more equipment uptime. I routinely recommend this product to anyone I know, and will continue doing so.