Just rode Banshee today and the rattle was so bad I wanted to get off after the loop. I rode towards the middle of the train so that might have affected it. Really hope they get around to investigating it.
I had a horrible ride on Banshee last year, and it's pretty sad given how impressive the ride looks. It gave me a very painful experience. I don't mind the little rattle on Diamondback, it is only really noticable after the first drop, but that's it.