I bought a used bike with Shimano PD-M959 on it.

I was thinking of switching to egg beaters as they would work with my SPD shoes (given I change the cleats).

I was thinking of getting Crank Brothers Egg Beater MXR Pedals as they are $50, lighter, and I am a fan of scrambled eggs.

Should I go for the upgrade, or is it worthwhile to have my expensive Shimano pedals on?

Thanks a bunch.