Just had a mellow ledge session on my 5.8 v-lights (with those flat washers that have the stem, and riptide pivots) with the ace bushings (low top, standard bottom) and damn, the bushings are good. No squeaking at all, super quiet and turns very smooth.
I don't skate super loose but can definitely see these being very surfy if you do skate loose. But even at my medium to medium loose setting, it felt a little bit turnier than stock without sacrificing stability. Felt like my truck was higher quality if that makes sense. Maybe its because of the fact that its dead silent so no creaking at all.
No sign of the bushings bulging over the flat top and bottom washers either, so far so good. Truck tinkering rarely makes you land tricks better imo. But in this case, though it was likely in my head, I felt a little more centered when popping and it didnt lean on the toes or heels unintentionally.
If you're willing to spend the money because you like to mess with your shit, I'd say its worth it. Definitely makes your trucks feel nicer, but if your trucks were working fine before this, it won't make you actually better at skating by any real margin.