i used to think much the same as you however after buying a u caller i have learned to have some respect for it , as i mainly use it for mr charles the first thing i did was reprogramme it with some better squeels and squeeks along with a more realistic vixen skirl and dog fox bark (all available on't net)
the beauty of it is simple you can stick it in a differnt location to your own and work it with the remote , this means that the annimals focus isn't on you but on the call source makes life a lot easier in my book next stop one of those predator enticers that too work on remote

The lads I go out with have tried various different electronic callers without success. We think they are useless! Someday we might have some rewards using technology. But notting beats cheap effective callers.
We use old skool methods like back of the hand, aero board and mouth callers to great effect. We have great sport, its all in the timing of the sqeaks and the use of the lamp. Team work is involved. We've got 8 foxes the last two nights out.