[Linked Image from i.imgur.com]
I got the GB40 off of Amazon for a hundred bucks. Arrived in two days.
This thing is tiny! I have been watching the reviews on youtube, very impressive. A guy was up in the snow up north, left the headlights on all night on purpose to drain the battery, plus he left the GB40 out in the car all night so it was also cold. It was 19 degrees outside.

He cranked that vehicle right up, switched it off and cranked it again. Must have cranked it 20 times. Impressive.

It is so small it will be easy to carry it around in the cab of my pickup.

Very easy to charge and very easy to use. You don't worry about finding an engine part that is unpainted you hook it right to the battery posts.
Very strong clamps with the GB40. If you should hook it up backwards, it won't blow anything up it will just refuse to work and a warning light will come on.
In other words, moron proof.

One aspect is funny. I figured it had a cord that you plug into a wall outlet. No.
You charge it on your cell phone charger. I charged mine at home off the cell phone charger but you can also charge it from the cigarette lighter in your vehicle.
It took me 8 hours to get a full charge.