RGPs aren't nearly as gas-permeable as hydrogel lenses. They also break and they fall out, and they're not as hygienic because you're reusing them so much. A year's supply of monthly lenses is about $200, which is about what I would spend on glasses.

As another poster said, you have to try different brands and make sure the prescription works and that they're comfortable. For example I couldn't stand having any of the Acuvue lenses in my eyes for more than a couple of hours, but the Biofinity lenses I use now are comfortable all day.