If you are still looking for a file guide .....
The pferd is excellent . If you are doing a lot of Stihl chain look at the Stihl FG1 file guides . If you are doing a lot of Oregon and Husqvarna chain ,look at the Oregon /Husq. roller guides . You have to dress the rakers separately with these guides , but they help hold the cutter angles better than the pferd . So, it's kind of a compromise . I've got all those along with the Timberline ,and the ATOP jig ,and a Stihl USG grinder . You can't go wrong with any of them as long a you take the time to learn to use them .