Not sure what details you're looking for - my first experience with sharpening has been with a Chicago Electric bench sharpener that I got from Harbor Freight that I have no complaints about. I set it to just barely kiss the teeth to remove as little metal as possible - which was enough - my perception is after the chain cut like new again. I recently got an on-bar sharpener at Home Depot just to try it for grins - one of the self-guiding units similar to this.I was waiting for more details from Robert before weighing in. We hand file (no guides), but do have an electric chain sharpener to give a whirl, now that we're getting bulk skip chain and are going to start spinning our own chains.
IMO a grinder is only necessary if you have employees who run saws but cannot sharpen a chain and you have to sharpen their chains for them. People who cannot file will tend to push a dull chain longer than those who can hand file, while a good hand filer will stop at the first sign of dulling and touch the chain up. When a non-filer gets done with a chain and swaps it out for a new one, the chain is usually far past a quick hand file touch up.
We just got a Chicago Electric off-saw chain sharpener. Gave it a go on the 200T, 372 and 395 chains. They were ripping today -- very aggressive and fast cutting. We're thinking at this point to do this once a week on maintenance day, then hand file through the week for touch ups. We'll see how it goes in the long term; this is just after one weekend and first day out in the field.Not sure what details you're looking for - my first experience with sharpening has been with a Chicago Electric bench sharpener that I got from Harbor Freight that I have no complaints about. I set it to just barely kiss the teeth to remove as little metal as possible - which was enough - my perception is after the chain cut like new again.