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I have a set of Steeda pullies. I went with Steeda because they seem to be the most widely used. They helped a little bit, but there wasn't any night and day difference. I'd recommend doing them at the same time as another mod such as a midpipe, or CMCV delete plates.
I went with the Steeda as well. They are by far the most popular. I also haven't heard of a single problem with these. According to Steeda, they manufacture the only ones using the new Ford CAD sharing system.
I've only read of one problem with someone running Steeda pullies. A while back I read a thread where some guy said that the weight on the balancer broke off. If I remember correctly, Steeda sent him replacement pullies for free.