I don't usually do reviews on items unless there exceptionally good, i have to say i am more than happy with results, helical head fits perfect and it was a breeze to install, although i would advise to make sure you have 30mm socket to help remove old knife head as mine was fairly stuck (brand new machine) i live in uk and parcel was delivered to my door inside 7 days, i run new head through some white oak , walnut and some sapele on end grain for chopping board and it cut like a butter, so smooth i was asking myself why did i got drum sander lol 6/5 stars