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944's have always had metal impellers. I don't think I've ever heard of one breaking. Then again waterpumps on 944's are changed every other belt change (60K miles) for peace of mind sake. But they are expensive. $150-400 each. And they are an all day affair to replace for most people. Because they are such an important part of the 944 engine, I'm not sure many people would risk using a water pump with a plastic impeller on their cars.
Then again my Camry has a plastic impeller-ed WP and they break all the fricken time. But they are cheap (about $20) and are a 30 minute job to replace.
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