I use mine hundreds of times more than I do sockets. But, that's for non-automotive uses. They're extremely handy for working in tighter quarters, and you get a better feel for the work, so not as likely to strip out or break a fastener. Also a lot handier for alternating directions, to work out a rusty or stuck fastener. And, for fine tuning an adjustment, which hex head set screws often are used for. Plus, you can twirl them between thumb and finger to drive the screw fast. Quite often, hex head set screws are in a deep recess that can't readily be reached with most sockets.
I'm also in the no ball end camp. What I end up using them for is lock screws on shaft collars, scope mounts on guns, assembly screws on machines. Those are usually torqued so tight and sealed with thread locker that you're lucky to get them out without drilling them. Ball ends won't even begin to work.