Product review (4 stars): They are certainly better than running the humidifier with no cartridge but they ...
I would give an 8/10 on its effectiveness on preventing minerals from vaporizing.  The original cartridge that came with the humidifier worked perfectly (10/10).  I've bought two of these replacement cartridges.  They are certainly better than running the humidifier with no cartridge but they still allow minerals to vaporize which translates to a very fine white powder settling on everything in your home.