I plan on eventually getting an Enzo Trapper and will get it from Ben's Backwoods when I do. From the research I did, some people thought that the D2 version is actually slightly hollow ground whereas the O1 is definitely a true zero ground Scandi edge. Don't know if that matters to you or not, but I'll be getting the O1.
I've never used Enzo's D2 so I don't know how good their heat treat is, but I do have a D2 Kershaw Outcast and the heat treat is amazing. I haven't used it extensively, but so far it takes a beating, regardless of what the "truth" is about D2. The Outcast is a 10" chopper so it get used for chopping, batonning, as a draw knife, etc. It's been used in green soft woods and old dried out hardwoods without any chipping so far. I personally haven't tried to sharpen it yet, but I did have it sent off to be thinned and sharpened by Siguy and he said it was a beast to work with.