This is my first 3D printer and it has been a great experience. It was easy to set up, mostly easy to balance, very easy to use and works great!

Had a little problem but not with the printer!
It was a slicing software issue. But had great tech support from Asta. Thanks again.
Fred From Texas appreciates the customer service

Works really good for having no idea what I am doing!

I great 3D printer for the money packed with lots of interesting features and almost ready to go out of the box with not much tuning needed.
https://youtu.be/dFBp6_KoYSY

Longer LK4 X is my fourth 3D printer. Amongst my Creality Ender 3, Anycubic Mega i3 and Anycubic Mega Zero, LK4 X is the best so far, and not even the most expensive one.

With magnetic bed, direct dual drive extruder, 3D Touch, silent drivers, Z screw top fixation, X & Y belt easy tensioning system, filament runout sensor, double blower cooling system, optical Z endstop and sensible cable management, there is really not much left to be desired.

The only thing I couldn't help regarding hardware was removing the extruder cover - that big piece of metal was only a dead weight for X axis motor. I also tried to speed up the mesh bed leveling with G-code, but with no significant improvement yet. Regarding firmware, I would really appriciate if Longer published the source codes for further tinkering - given that main board firmware is open-source Marlin, it shouldn't be a problem. Also having access to LCD firmware would be greatly appriciated - I really miss seeing a remaining print time estimate, and I would gladly translate the controls to CZ, SK and PL.