I think it's mostly bull****. sorry. with those new edge trems the 555 should be a decent guitar. hell, I would say it was decent before. people here just have a problem with the half vine inlay and the "jr" on the headstock (personally, I think they could have skipped the dots on it, leaving half the fretboard empty). plus they love the edge trems more than anything on this earth.
if you find a 555 that you really like, and the price is right, get it. if the trem acts up on you, you could always put a new trem in there (a good luthier doesn't charge much in case you need to modify the cavity). personally, I'm thinking that maybe I would prefer the "poor" trem of the 555 over the dead neck on a 7dbk I tried out a couple of months back.