In My opinion these aren’t that expensive in kit. Most of my filters cost between $150-200 each. This kit was $500 ($400 on sale) for 4 filters, ring mount and case. At least for me they were a bargain. I actually shook my camera with one on and it didn’t budge. I wouldn’t walk around with camera on my hip with one on but they are so easy to mount I personally don’t believe it will be an issue. I can’t speak to science about magnets but if they caused problems I’m sure internet would be full of complaints about them.I have never used the magnetic filters, not only because they are expensive, but I fear that the filter might fall off if I inadvertently brush it against any object. I also fear that a magnet close to any gadget that has electronics in it, is not a good idea. My fears may be baseless as the magnetic components would be far away from the body (which has electronics in it). This thought has always plagued me. Can someone with a knowledge of electronics put me at ease? Thank you.