sorry deano. im still dubious.
a bad work man blames his tools but a master craftsman know quality (or lack there of) when they see it.
im only going by what i see. i cut a few cuts in a trim that was left there. the cut was terible. when the miter was put togehter like in the video it was fine but when laid down flat like it would be on a wall it opened the miter by 3-4 mm.
i cant see how its user error. im putting in the trim , holding it there, taking it out , do the other bit, then see the crap miter. it might be the trim. im going to see if i can find some trim with more of a self supporting cross section. the one i used was large and had nothing inside the curve to support it.
maybe you could do a demo with the trim left flat on a table please