My wife uses Speedplay Frogs on an 04 Sirrus Comp because SPDs bother her knees. They work well for her. I use SPDs myself. Give the SPDs a try if you already have them. Remember to loosen the cleat tension screws before you try them for the first time. Just 1/2 turn in from completely loose is what I used.

Frogs and SPDs use the mountain bike cleat screw pattern. They are not interchangable with most road cleats, including other speedplays.