Ups and downs but unfortunately the downs outweigh the ups for me.
I really loved the glossy quality of the book covers and pages. The inside pages kept their details really nicely in comparison to other printers I have used in the past. However, one glaring issue I faced was that 21/30 of the books I ordered had covers that were not aligned properly. 9 of those copies were completely fine but 2/3 of the order was not. 21 of those copies I am a tad bit uncomfortable selling to customers at full price so I will more than likely have to discount them. I also like to compare speeds to KDP printing and shipping so I will order same amount of copies at the same time and I will say they have roughly the same time frame. KDP lacks in overall color quality but images are still crisp and in comparison Mixam had a bit of a blur. You could argue that these quality issues may be caused by formatting however I only keep a single pdf copy of each of my books for this exact reason, so that the formatting and files are as consistent as possible throughout all varying printers.