I have a couple of the NOCOs, a 1000 and 1500A. We keep the smaller one in whichever Delica Jasper 4x4 we happen to be driving, the bigger one around the place for the big Dodge or whatever else. In an alternator failure, the smaller one was more than enough to bring my girlfriend and a diesel van that died with a depleted battery back to the house as the sole power supply. The bigger one jumps a V10 that has had the stereo/accessories/inverter running for far too long, but then again, I can leave it in the sun if there happens to be any, with a GoalZero 27W foldable panel for 45 min or so and get the same result. My experience with both of these is limited to a year or so. We live fairly remote, off grid in B.C., no close neighbors, so all my vehicles have 2ga. jumper cables I built, try to be self sufficient as possible. They seem to perform well, the "little cables" don't overheat in usage, and I scored both of them at a good discount on Amazon. The mini USB output and their small size/weight, make them useful for all kinds of things around the place as a portable power supply when it is cloudy as our solar systems are pretty modest. Have to say I'm pretty happy. My complaint is that they are too smart for their own good. Twice I have had to jump an older S500 Mercedes with a battery so depleted the NOCO will not recognize it as a battery and refuse to function. Once the override worked, car started right up, once it did not, battery too dead. If I am off the end of a road with a cell booster and still no service, no chance of help other than walking back, I want a system that dumps whatever wattage it has into that battery. ******* safety, I am standing there watching it, not like something bad is going to happen behind my back. The old school "heavy" packs would never have this problem, but they don't cost that much less. Weight, space/size, portability, cost, it's all a tradeoff. The NOCOs are very capable.