Just to add one thing.
A triangular leveling system is actually better. It’s a bit counterintuitive, because we’re looking at it in an X/Y orientation, but it’s always 3 points that define a plane, so 3 points is the best way to have a leveling system. With a 4 point system, it’s possible to get a warped plane, which is a bad thing all around. It actually becomes more difficult to get a flat levelled system. (Example, a 3 legged stool never wobbles.) It takes a bit more patience to level the bed, since each screw affects both X and Y dimensions, though you can level the X dimension via the 2 screws in the back first, then level the Y with the one up front.
Also a caveat to the “good prints” – I can’t seem to get them to stop warping. I have a lot of printed objects with curved bases along the bottom, and it’s getting to be a problem for things that I want the printer to do. I have found that it’s mush better than the old Prusa i3 that I have, but I sorely miss having a heated print bed. I am therefore going to build a solution for that problem.