How good is a sub ?100 3d printer ?

[curious aardvark]

That's a bugger.
I don't have a problem with my board - yet.

Don't forget the mks gen-L also needs seperate stepper drivers.

https://www.ebay.co.uk/itm/MKS-Gen-L...UAAOSw3uhbMXzW
?16.48 from uk - goes as low as ?13 from china. Depends if you're in a hurry or not :-)
And it doesn't support dual extruders. well there aren't enough stepper sockets for it anyway.

I do have a spare mks gen 1.5 board around if this one dies.

I do have a serious issue with the firmware. It's truly awful, plus steps are wrong so prints stuff too small.
Thinking of switching to repetier, like the delta runs.
Not as good as sailfish on the rep clones - but from what i can see, way better than the version of marlin on the i3.

I mean what kind of 3d printer firmware doesn't even have the option to load and unload filament ?
I'll tell you: marlin 1.0

However never having flashed firmware on a working machine - currently awaiting to see what wisdom roxy has to share on upgrading marlin.
Got no problem with a twiddly-pushy knob screen. The most important bit of the upgraded (even if still real cheap) screen is a full size, easy to gt to sd card slot).