My parent's SUV is five years old now and anything can go wrong with the battery.  Initially I never really wanted to buy a portable jumper because they were all too big and expensive and the small ones looked clumsy.  I stumbled upon this one and I knew just by looking at it that it would satisfy our needs.The JNC300XL is very sleek, it's small, and built like a tank.  It's heavy (about 10 pounds.)  I have the nice little trunk bag from [...] and this fits in there with their portable air compressor (very snug at that.)  One time we were at the airport and my dad left the lights on and we were stuck in the parking lot with a dead car in a creepy area.  Luckily for us, we were parked away from other cars and a nice person helped us out with a jump.  I don't think we might be as lucky next time.  When a situation like that arises, you wish you had something like this.  Again, I'm not for carrying a bulky jump starter because I don't like my trunk cluttered with stuff.  The JNC300XL is just the right size to carry in a medium-sized trunk bag. It just feels right when you hold it.I also like how it has a built in flashlight and you can use the 12 volt outlet to power a dead cell phone or some other 12 volt appliance.  The cables are nice and are 4AWG and the clamps are very sturdy.  Removing the clamps requires a little bit of force so keep that in mind if you are not as strong as you used to be or if you have arthritis.  Griot's Garage sells this same item for one hundred dollars under their name.  The only difference is they give you a lifetime warranty and their item is red in color.  I bought this from another online retailer for fifty-eight dollars plus shipping.  So do some shopping before you buy it.I'm glad I bought this item because even though you won't use it everyday, it is a lifesaver when you need it.  Also you can help your friends and neighbors out when they have battery problems as well.  It's a fair price and the quality is outstanding. It's hard to find quality items that last these days. I'm very satisfied with this purchase.