Ive had an ender 3 pro for about 5 years. Setting it up was straight forward I just followed a YouTube video which had some tips to help make sure the frame was square.

Ive never used the included slicer. Only Cura which is pretty great.

It’s definitely not the fastest but it’s a great beginner 3d printer and there is no requirement to tinker with it. I just level the bed and print each time. No problems 5 years in. (I did have to replace the removable print bed top at one point but that was partly because I’d gouged it before I learned how to level it)