Hi there,
I bought the gmx but returned it. I liked the build and quality, not the small monochrome screens. Not very suitable for waveforms and wide searches of music on your USB
(Above means I am not good at beatmatching on sound and I have not so organized libraries on USB)
I would recommend to consider whether you really want and need a device that can work standalone? (And midi).
I did! I bought the Stanton scs4.DJ…and this works for standalone! ( a little less in midi mode since it does not have a soundcard for this purpose)
Standalone? No need for waveforms? Within budget? Gmx is good
Need other / more? Then reconsider
Good luck