I have used it for several table runners and a hot pot holder and love it. I did notice one or two silver flecks but they cleaned out nicely. I don't think the silver flecks should be any more problematic than other lint, fabric fibers or thread pieces. It really isn't like aluminum foil in texture or anything abrasive. IMHO. But you really need to use your own judgement about what your are comfortable doing. Myself, I just bought a whole roll online for a good price. Probably enough for the rest of my natural years.
I've used it and consider it's "lint" to be just like other lint.