I just built up a Q0 Plus with this foam, and it's really great. The Q0 comes out of the box without foam under the PCB. I used the solid foam and placed the insulation layer that came stuck to the underside of the PCB under it. The plate foam fits really well, and maybe better than the original stock foam that came with the Q0, and I was able to use it to get the sound I wanted. I also like that Keyboard Kustoms includes all the different foam pieces so you can make it sound and feel exactly the way you want. One thing to note is that like on many other Q series boards, if you install both foams under the PCB, the PCB is going to sit on the foam and the gaskets on the plate are not going to do a lot. It makes for a totally different typing feel and sound if you like that feel. If you put in either the solid foam or the foam with the cutouts for the switch sockets it will still have the bounce you would normally see on a gasket mount board. It does change the sound, so you can experiment with it to get it feeling and sounding exactly the way you'd like!