Yeah, my biggest annoyance is I lost most of my pics so the threads are in bits and pieces now. Being able to have large albums now is nice though.
Mine never rattle or anything. I think the key is fitting snugly against the hatch while some might try to leave a gap thinking that will help but you can't really keep it from bumping. The rivets on mine were loose as well, some even broken off, so fastening them better will reduce flutter in the slats. Perhaps I just can't hear what little noise they make over the sound of the engine It might also help welding them to the center rib with I didn't do (they just have one or two rivets there). They hold tight but can still bounce around a little which I notice when I slam the hatch closed. Also the rubbing right at the joint can slowly wear the paint off.
I don't think there are that many styles, it's just that most aftermarket ones are the pointed metal kind (they all look identical but some mount differently depending on how cheap they are). Then there's the plastic alternative which has it's benefits at the expense of style. The rounded aluminum ones you're seeing were a factory option on the later models if I'm not mistaken.