I think this is a good move. Some tools are worth their weight in gold! In my opinion, a good set of nut slotting files and a good fret file are essential. I have a set of Hosco nut slotting files for electric guitars, and one for bass. I did cringe at the cost, but I do not regret getting them.

I really like the tapered sides on these files. I think they allow for slightly larger strings to fit the slot.

I also tried the torch cleaners with limited (or no) success. I have also tried the "blade" style slotting files - but found they are not as user friendly.