I’ve played with their stuff a few times.
I bought a bar and chain combo initially. Stihl 66dl full Chiesel. The bar crapped out early. About 1/3 the life of an Oregon bar. The chain was very slow initially. I think it cuts a wider kerf initially. It did speed up after a couple sharpening. But after a couple more of wouldn’t hold an edge good.
Bought a husqvarna pattern bar, didn’t run it a lot but was fine while I had thesaw.
A year later though I bought 3 .058 chains for my using a bar up experiment and those have been excellent chains. I’ve sharpened them on 20* though. I get a cord between sharpenings, that’s great for me. I’ve pretty much used them up and I haven’t had to put links in them, but I do run a 8 pin rim. Pretty tempted to buy a roll after this go round with them. They don’t even act like the same chain, besides they were slow out of the box.