I have a
JS100 as well, and I had some fret buzzing issues. Because it's a lower priced model, I just decided to take to it myself. I picked up a 9.5" radius block from Stewmac, got some doublestick tape and put some 600 grit paper on it, and lightly leveled the frets. Smoothed them out with 1000 grit paper and then 0000 steel wool. It worked out great. Got rid of the buzzing.
There's lots of tutorials on the web and Youtube. You could always practice this on an even cheaper neck you don't mind trashing.