I own both knives.
I suffered a month of carrying the 561 before I finally called it quits. For me, it's not a "hard use" knife, it's a hard to use knife. Any cutting task lasting longer than five mins without gloves will leave you with the text book definition of hotspot. The edge was pretty much a pain in the ass. I am a mechanic, so I used the knife for cardboard, rubber, small gauge wire, some scraping. The edge didn't hold up well in those uses. The steel was a pain to sharpen. I use a DMT for shaping and Naniwa's for the rest of the progression. I had problems with the lock about a week after I started carrying it. The liner started sticking to the point where it would take both hands to release. I sharpied it, that lasts a day or so. I really wanted to like the knife, but as a user, it's just terrible.
The Domino has been in my pocket now for a couple of weeks. I use it for the exact same thing as the 0561. So far it's better in every way than the 0561.
Bottom line. 0561 great mall ninja knife. Domino great knife to actually use.
Cheers