Keylocks have their advantages (well we tend to think this, over here), but it can often be VERY useful to have key and com together.
Maybe you are having a safetech challenge at a lock show when it would be fun to have a "secret" additional lock fitted.
Relevent to people here though, if you have a beautiful antique safe, which is minus it's uniquely footprinted lock or never had a decent lock fitted originally, this is another situation where this lock would be great.