The rear hexes are nice... and if a nut isn't fully tight they are less likely to spin on the hex than a pin. The fronts were really convenient, but my c clips gave way and caused issues (had the nut too tight trying to avoid losing a front wheel like the losis are prone to) On a practice lap, the c clip bound the axle when it was rubbing the kingpin, and by the end of the race a bearing had exploded. I'm back to pin fronts since the convenience isn't worth a dnf.