I have been getting my saw chains sharpened (for me for the last 20 years), since it has been been cheap, well done and easy(er). I have the proper round file, with guide, that I've used for touch ups.
Since moving to rural Iowa, I had to find/choose a new hardware store for this (normally painless) task. I took five chains in, and two weeks(!) later, they were done - after I called 'em they got done that day. Tried one, then the second "sharpened" chains and got sawdust. Arrrrg. I checked the chains and they indeed were sharp, but the rakers were not addressed. They are flush with the cutters. I have now bought a depth gauge and will need to re-do the chains, by hand. Since the closest chain sharpener is 30 minutes now, I will start doing these myself.