I found the Stihl/Pferd 2 in 1 to do quite well, and it is quick as it says the depth gauges as well. I hand file with no jig and get a 10 to 30% better cutting chain but it takes me 20 to 30 minutes on 28 inch and 32 inch chains. I do use a West Coast Saw file plate to set the depth gauges.
My hands cannot take filing 3 or 4 chains at a time anymore so trying to figure out square grinding with a grinder.
A sharp chain is critical to your chainsaw experience.