I wanted to explain how I decided to purchase this Jump-n-Pack so my review is long Sorry!I have used many Jump Packs & all have worked OK in the past until I purchased a Larger Diesel Truck that is. This truck is a Mitsubishi FE140 with a 4Cyl Turbo Diesel engine. It has two Batteries & we have two inverters, a fridge etc that run of the truck.One day we was shopping but when we returned to the truck no start because we left lights on OOPs. Now the store we were at had a normal Name Brand Jump Pack like you see in most stores. Unfortunately it didn't work at all.So we called roadside Assistance which was to say the least an adventure.1. After over two hours of waiting & mis-communications a nice guy in a Honda that was barely running showed up. I was literally laughing as he pulled up with his little yellow light on the roof. His car was barely running. All he had was a smaller Clore Jump-n-Carry which didn't do any better than the other one we tried earlier. He gave up eventually2. Roadside Assistance Apologized & said they would send a more appropriate vendor to jump our truck.3. Next a truck larger than ours showed up so now Im thinking we are in good hands. Well he had a direct connection plug to use his truck to jump us which did work but not before trying for 30 minutes.So after all this my BoyScout side said I would never be left in this situation again so I researched many Jump Packs on the web. Finally finding the Clore JNC660 which had a few reviews about it jumping even Larger Tractors which have multiple batteries. I decided I had nothing to loose so I purchased it during a Xmas Lightning deal thinking how is this Jump Pack going to work on our truck being this inexpensive. I purchased knowing Amazon would back it up & also thinking I could use it on our boat if nothing else.I also made sure I was getting the newer model based on some reviews saying they didn't receive the updated model. At first all seemed well so I didn't get to test it out since I wasn't going to run batteries down purposely. Finally there was a day it happened the truck didn't start because something ran the batteries down. So I pulled the Jump-n-Pack out thinking I hope this works.First of all it had nice long reach cables which was awesome since all others I have owned or tried had very short cables that required holding the jump pack up over batteries. Next I hooked it up went to cab tried to start & it fired up almost instantly to my amazement.I have now had to use the Jump-n-Pack multiple times on this truck because the Fridge was running batteries down very fast due to defect. The Jump-n-Pack has not failed one time & has had to jump this truck not only once on a charge but 4 times in same day.I know it is It is just a simple Jump Pack but it does the job so well all my vehicles will have one soon.Update 08/19/2013:I have been using this for quite awhile now & it has never let me down yet. I have used it to boost my Fuso Turbo Diesel truck multiple times, Our Land Rover, Lawn Mower as well as our Boat. I will purchase a backup second one when Amazon puts it on sale again.Now there is one negative to mention. After using it quite a few times I have noticed the cables getting skinned from the way it winds them up. I have found you must take extra care to wind it up just right to prevent this from happening.Update 09/12/2013Today Amazon put this on sale again so true to my word I have purchased a second one.I also wanted to add to my review I recently had to replace both batteries on my Truck because they both had dead cells. This is even more testament to this Jumper because it was still able to get my truck running even with two bad batteries that were low on water also.