I bought a Turbo Saw with the grapple about 3 months ago. Man, do I love this machine. I've have cut and hauled a ton of mesquite and huisache trees (central Texas) with it. Most of the stuff that I'm cutting is 4 to 8 inches in diameter. I've cut several trees larger than that.
I've posted a few videos on YT, here's one that shows me blabbing a lot, but also with the saw in action: