I ran X-ray T4's with X-ray ecs's last season, also ran my R10's with arc dcj's. I can honestly say the arc dcj's are more durable that the X-ray's. I actually snapped an X-ray shaft with only a handful of runs on it. Only broke one cross pin on my arc dcj's all season. Hudy spring steel isn't what it used to be! I've tried SpecR dcj's, they're ok but get sloppy much quicker than others. JMO
Jim C.