My case came with 9 of them, and after some googling (even in the instruction book they don't use them) it seems the majority of people do not use them at all. What are the pros/cons of them?
My mobo has 7 metallic screw holes and 2 that are not if that helps. Also the stand-offs are brass/bronze or something like that. Just want some clarification before I build, don't want to fry anything.
Depends on the Mobo. I have found that all the modern Mobo's I have worked with, the mounting holes are already issolated. On a side note, if you have any concern, use them. It really adds about 5 mins to your install and will not hurt.
I thought the other guy who had his brand new self put together computer earlier not work because he hadn't used them was unique.
But you HAVE to use the brass spacers. otherwise your motherboard will be to low and will be resting on the backplate. meaning all the nice little solderign points on the bottom will be shorting themselves on ground.