I own a custom fab/engine conversion Shop and I have tried about every jump pack on the market and was worried that I bought another jump pack the would not stand up to the hype. When I received the jump pack I opened up the box and put it on charge. My first impression was that it was pretty small compared to my Noco GBX 155.(which is junk in my opinion) its much smaller and was worried that it was another jump pack that was junk. I have had it for about one week and went to start my Kodiak 6500 and the batteries were totally dead. So I hooked up the jump pack and prayed that it would start. Turned the key on and waited for the glow plugs to cycle, and my air suspension compressor turned on. In my mind I thought there is no was that thing is going to start. So I turned the key and it started with no issue at all. I am very impressed with the SPC jump pack and will defiantly promote there product. The only issue I have is the case needs some work as mine was cracked when I received it.