Do you have any specific questions about the ADO?
They're machined out of a solid piece of steel, decently weighted.
They're just as sharp as all the other MTs, but I couldn't say for sure how long they hold an edge. I haven't abused one yet. I really can't see a reason for this knife to fail.
The hollow in the handle extends about the length of the grooves. So it's pretty deep.
The sheath is keyed on the tanto version.
The sheath comes with an adjustable belt loop so you can wear the knive in any direction you want.
The retention on the sheath is really tight. If you had this knife just slipped in to a boot and tried to yank it out, I would venture to say it would almost always come out with the sheath on it.
If you had a reason to carry a fixed blade and wanted something really unobtrusive, I would say the ADO is great. If you're looking for something to EDC, then definitely go for the Troodon.