Aliexpress 40 percent, are they worth it?

Im seeing these 40 percent kits on Aliexpress, and I wonder if they are any good. What comes up the most is the RS40, and some split HHKB layout thing. Could they be any good?

I have seen a ton of people do some really cool things with the Libra Mini.

Putting stickers or custom prints under the acrylic etc. It feels nice to type on when I have tried them at meetups. I think the only complaint I have heard is that the joystick tends to go bad pretty quickly and people need to look for replacements.