I bought this kit for my daughter's car six months ago just in case she ran into in any issues, luckily she hasn't. Instead, I got a chance to use these a couple of weeks ago, when a friend called my wife to ask her to send me to help give her a jump. The battery in her Hyundai has clearly seen better days and basically conked out on her while she was at work.
I managed to get the spot next to her, the cables are long enough that I probably could have hooked them up parked behind her. The cables are clearly labelled and directions right on a handy card attached to the cables, it's been a few years since I had to give a jump, so having the instructions handy was reassuring.
Anyway got her enough juice to turn the engine over so she could make it to the garage for a replacement battery. I got a nice thank you dinner out of it so I am already ahead from this purchase.