Most are brain dead clerks at convenient stores...that make a face like you asked them to explain the theory of life.
I have to drive 30 mins to a check cashing store...that load it in under a minute.
Usually at the convenient stores around here...the clerk usually says 'machine is down' (aka has no effin clue how to work it) or attempt to while taking 15 mins & making everyone in line pissed off at you.
Thats my general experience...only use check cashing stores that use 'em.