Does anyone use the Stihl 2 in 1 File Guide for sharpening their chain?

I had heard some good things about it and just bought one, but now I see it is only for 30 degree teeth.
(I also have ripping chain to sharpen and I believe I have some chain with 25 degree teeth also).

So now I have some doubts and might return it.

Does anyone use this or know anything about it or other comments?