The flat grind is NOT a full flat grind like you find on a Case Sodbuster. It's actually closer to the Scandi grind of a Mora.
Similar to a Mora, it's a great heavy duty blade. It works wood really well and I would trust the edge to not damage as easily as a thinner hollow grind like most Bucks.
On the other hand, you really need to know how to freehand sharpen on a stone and need to be willing to scrub down the entire bevel of the blade like you do with a scandi. Otherwise, if you just continue to micro-bevel the edge, the edge will get very thick very fast.
Like a Mora, mine is a terrible sliver of things like potatoes but that's to be expected and is not a ding. This is a hard use blade, not a winner of tomato thin slicing contests.
I'm in the process of conveying and thinning mine. I wish they used this grind on some of their outdoor fixed blade where the power of the Sabre-flat grind could be used for splitting (like a Mora). In this way, I think the blade is too powerful for the 110 handle. I'm not going to baton a lockback. Perhaps at some point, I'll get mine closer to Opinel thin/convex and that would be dandy.