Well designed and works well. I really like the volt meter built in to see how the battery is holding up to the load. As you can see in the pictures, this meter is within about 1 tenth of 1 volt compared to my nice Fluke multi meter. I like the USB ports being marked as to the amps they output. I like the display and think this unit is esthetically pleasing. I like that they included mounting screw. The only think I with was different is, I wish the lead in wires were longer.