As most have already stated the bottoms are crap, like a lot of the Factory High Quality Top Notch Best Money Can Buy chrome. Any decent plater can do the job 10x better.
My main complaint is that the little 'hero pegs' don't throw enough sparks. I drag mine quite a bit and they scrape nicely, but nice sparks would add to the effect and scare the HD guys behind me even more.

A word to the wise is not necessary. It is the stupid ones who need the advice. Pat