Well for 5.5's I've run Novak, Wave, X12 and Speed Passion V3's. The X12 seemed mentally fast compared to all of the others! So much punch and top end, the only place it wasn't too much for me was Southport outdoors.
My favourite was the Wave, smoother than the X12 but just as good top end, but it blew up
Speed Passion seems very good, love the plug system, but not as insane as the X12.
Have been considering a 6.5 X12 with 12mm rotor to help top end, am confused by the stats though, based off revs pr volt the speed passion is way higher and I'd not want to lose top end, do some companies talk bull in the specs like revs per volt?