I keep one on my bike at all times....aftermarket audio is pretty baller and it will drain my battery...and the new Milwaukee 8 engines need all the cranking power a battery has got
they absolutely work, but I've never had to use it on my bike....I have used it to start my truck though, as it sits a lot...and a lady in the parking lot of a restaurant seemed to be having issues once when my wife and I were pulling out, we stopped and sure enough, she needed a jump
she laughed when I pulled out the little jump starter....I laughed when her car cranked right up
they work, it's more compact and portable than jumper cables, and while I have both in the car, if i had to either or, it would be the portable jumper
NOCO is the one you want, or one that looks like it, but is branded different