I'm curious.
I would think (according to what "they" say), that no matter what brand scissors you use, you have to consistently cut from the 'joining spot' all the way to the tip to prevent dulling them.
"They" would be my high school commercial sewing teacher. She preached this and I always try to do it.
Having said that, I went to the site and I see a pair in my future...join to tip, lol!