I've never tried to focus. I'm always much more tempted by a pen from a brand I don't have than one from a brand already represented. Having said that, I do prize my Wahl pens, and if I were to focus, it probably would be Wahl, though Pre-Skyliner. I have two Tulip Clip pens and would be delighted to have more. Same with the gold fill pens in their various engraved patterns.