Well, I used Alcon Opti-free express at first for a month or two and then switched to Aquify at the suggestion of my doctor for the bacteria protection and must say I am very pleased with the Aquify over the Opti free. I think my lenses are cleaner, more comfortable and I don't use comfort drops as much as I did with the Opti free.express MPS solution. And if I do use comfort drops I also prefer the Aquify drops over the Opti free refresh drops.

Hope this helps you.

Miss Kitty