I haven't dabbled in custom keyboards nor do I consider myself a keyboard enthusiast.
I have 2 (now 3) "mechanical" keyboards: Cheap Corsair Vengeance K65 with red switches that is decent, really loud and retro Unicomp Ultra Classic, and just a few days ago I bought a Ducky One 3 SF. The unfortunate thing is that the corsair one has a little bit of ping sound when pressing hard, and the Ducky one has a similar problem that's somehow more noticeable. It's not loud but I can hear it in every key and I wanted a keyboard specifically without the ping! Everything else about it is great but I may have to return it now
Here's my Unicomp unboxing: