I have the Coleman version. Mine is over 5 years old now and has started my truck (25 year old V-8) when it was 20 below outside, it's started a Chevy Lumina 3.8L V-6 that didn't even have a battery in it, it ran my 800W inverter with about a 90W load on it for several hours and still started my old Toyota.
I will swear by it for years to come. If the little battery inside it ever goes pop, I'm going to open the case and order the exact replacement it has worked so good.