Bests & Worsts Reviews from Amazon

I bought this to eat a variety of soups, as I'm a technician in the field, and sandwiches just get boring after a while. I bought this and plugged it in using the 12 volt card adapter and was very disappointed, as it didn't heat up very well, or very fast. I even got to the point to where I was looking up similar products, to replace it when I decided to try plugging it in with the 110 volt cable it came with, instead, to my inverter. It heated up WAY MORE, and WAY FASTER. Now after about 45 minutes to an hour I have piping hot soup. Nowhere in the instructions, or in these reviews do I see anyone mentioning this, so I thought I would share with the rest of Amazon. Enjoy!