The cage itself is well-constructed, but does have some issues. First, it is not compatible with at least the EOS R battery grip base plate. Second, if used with any battery grip I have ever seen it will block the battery exit, so you have to take the whole thing off to get the battery out. Third, mine came without all the parts, but PMG did quickly send me the missing part. I did not receive the generic bottom plate, and looking at the description it isn't clear if that is included or not. I like some of the designs from PMG, but packing and compatibility (and full disclosure) seem to be issues. I hope they figure that part out as some of their pieces are very nice.