As you can see, my success was more due to having the right tools than to any intricate knowledge about one package or another. I have been using it for about 6 years. I find it very versatile, very easy to use, and it gives great results. You will find that it is well worth the time. It is compatible with AmS-LaTeX. You can use any fonts that work with LaTeX, including PostScript fonts and AmSFonts.
Slides can be landscape and portrait within the same file.
Color is supported through PostScript. The slides can have a frame and a colored background. The magnification can be changed with a single command. Overlays can be produced from a single slide environment. Accompanying notes, such as the text of a presentation, can be put outside the slide environments.