Many people on the JG Maker Facebook page are complaining about under extrusion. I have not had that problem at all. Now it might be because I have the Pro model which was manufactured much later and may have better quality control or it might be JG Maker changed something.
Here is a sample print up close and you can see the quality is quite good.
This was printed from IdeaMaker using MatterHacker PLA at 200c, .2mm layer heights, and a default speed of 60mm/s.