Best ifs kit? rms, hdk, gt suspension, or magnum force?

Spun Bearing said
where is this listed??? Is there a website? I haven't seen one picture of one of these in use or any published specs. I'd be calling b.s. until I heard some ride and drive reports online from independent users. jmho before I spent any money.

Also...hemidenny nor RMS have their respective specs posted on their website either....or at least I cant find them. So where's those specs