Ya they have been great, blade literally moves freely with no resistance,lil copper sleeve looks seized and just FYI anyone with a summa s class, tech told me to lube the sleeves about every 30 days , keep things working even smoother, I never did, was never told, think that's what got me, I'll cranker up to 40 for fast plotting, then it happened, thanks for the replies, and yes I love my summa of the opus with my Mimaki , contours amazing !