After two weeks of using the cross cutting blade, I would hazard to say it works and is sufficiently durable. The combo of metal and annealed plastic PETG blades works surprisingly well.
I did break a few. Mostly by cutting much lower than Yarbo recommends, 1.5 inches and my aluminum disc mount nut had come loose causing a wobble. I tightened them both and it is no longer an issue.
Mulching is pretty good on small sticks and leaves. It might take a couple of passes but it’s better than stock non pro mulching blades.
Happy Printing ( I think I stole that 
)
Dave
