I've purchased my first Arca-Swiss ballhead,the Photoclam PC-36N. Surprisingly, it didn't come with a plate from ReallyBigCameras. I've emailed them as I'm sure it must be a mistake. Nonetheless, my understanding is that the Arca-Swiss connection is fairly universal, and so any plate designed for the Arca-Swiss system should lock securely on this head, right? If so, the Photoclam universal plates are $31, whereas the Horusbennu plates are $10.
Any reason not to buy the Horusbennu plates? I'm sure someone will say buy an L-plate, and rest assured, I have one for my 5D2, but this is to be used with my 60D and G11 as needed.