If it is DAO, it is a Pony, not a Mustang. The Mustang is SA and has a thumb safety.
I had a Pony and sold it. I did not like the horrendous trigger pull, the fact that the trigger pin walked out on occasion, that the gun rattled (loose slide to frame fit), or the fact that I had trouble shooting it well. It was my pocket gun for a while, but when I found Kahrs, I unloaded the Pony for the last time.
The Mustang uses the same mags, but is a much more nifty gun in my opinion and the SA trigger makes it easier to shoot well. Unless either has after market sights, the sights aren't great, but are functional.