A grinder does make it easier to sharpen a chain but acquiring a grinder doesn't really solve anything because in my opinion there is a significant learning curve. If you can't sharpen well with a file, you may find a grinder difficult to use as well as they are two different methods to achieve the same results. But one must know what they're trying to accomplish. I see a lot of grinders out there with very little wear on the original wheel.
One of my good friends who had been logging for 20 years could never master the grinder and sold the only one that he ever bought. He always file sharpens in the field and that works for him; but, the grinder does not work for him. To each his own.
