I have had my Ender 3 for quite a few months and have made hundreds of prints, mostly successful. I have also made many upgrades and I have to say the first one I should have done was going to a 3 point leveling system. Basic geometry tells us that 3 points define a plane and more points are not only useless but make things more difficult. With the 4 point system every time I adjusted one point it would move the other points also and took a lot of fiddling back and forth to get them all the same, sometimes with one so loose the knob would work it's way off while printing. With 3 points all it takes is one adjustment at each point and you are done. It is also more stable and now I do not have any reason to need an auto leveler.

Is the filament runout connection on the silent 1.1.5 silent board come active or does it require more firmware? Are the 2 sensor pins normally open and close when the filament runs out?

I installed the new quiet board (1.1.5-4.2.7 and says Ender 3 Pro) in my Ender 3 and it really is quiet. The problem I'm having is that the hot end temperature constantly swings 4-5 degrees above and below the set temperature and won't hold steady. Most of the time it won't start printing, just says "extruder heating", I have to fool it by preheating 20 degrees higher than the printing degrees then lowering the degrees after it auto homes when told to print. Amazon sent me a replacement board and it does the same thing.