(disclosure: I work with Alex and he showed this to me before)
I think the page doesn't emphasize enough the easy customization of these buttons: you can set the class names and base colors in one file and Sass will create the CSS for what you want. "Base" colors because the gradients, highlights and glows are then derived from only one color.
See this file in particular: https://github.com/alexwolfe/Buttons/blob/master/scss/_optio...
The defaults look pretty yummy but the customization is key for your own use IMO.
