Personally I can't stand magnets. I don't think they add anything positive to our hobby except, maybe, allowing very young children to participate without needing to concentrate. They have definitely contributed to sloppy product engineering, because the massive amount of grip they generate very effectively disguises poor tyres, poor track surfaces, poor chassis design and many other things.
Of course, to each his own, but I do not know one slotter who, once introduced to magnetless driving, has returned exclusively to driving with magnets.