Depends one what you need it for. IMO, for making plugs it isn't the best (if you are talking about the hand held digger). I prefer using my Sampson or the 3" wide blade on my Wilcox. I had the Raptor made by Predator tools and it even works better for making plugs, but it isn't my cup of tea.
For digging into the sides of holes it works pretty darn good. It is more of a precise digger rather than a plug maker. Durability wise, it ranks up there. I bent one, but it was by putting my weight into it and trying to break roots, which it isn't meant for.
I like my cheap T-12 from TreasureWise better than the Lesche to be honest. It's great for digging deeper once you cut a small plug. I don't care for the skinny tip of the Lesche for removing dirt down in the hole.