Completely agree! Love it and the (very, very similar) Strings by Mail glass file. I have both; the Wolfram is just a wee bit better. You have to be careful not to take off too much nail with these files, they're so efficient! These and bit of high-grit mesh for polishing edges, are all you need, yes. (I use those Oasis shapers to finish, fwiw.)
The mini sizes are great for pocket or purse and work every bit as well, btw.
(Can we split the deal? lol)
2015 Connor spruce/Indian rosewood
1978 Ramirez 1a cedar