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It really depends on if you're buying it for its underdriving abilities or its weight loss. I know for the 3v mustang the Steeda crank pulley is a pound lighter, and the water pump pulley is negligibly heavier, so weight wise pretty meh... But at 25% under drive, they really help NA cars. It will tighten up the over assisted steering, and newer cars produce more than enough amps so it won't effect electronics. We gained 9rwhp on a 265rwhp car and gained maybe .5-1mpg from the 25% UD crank pulley, and the 25% OD water pump pulley.
Also all Ford pulleys are balanced like oem. So if you find you a good udp set for your car that is balanced and underdrives a good bit, ignore the weight loss because it won't do ****.
The same guy who designs the Ford oem pulley also designed the Steeda UDP so apparently oems believe in UDP. They just want you to spend the extra doe $$$.
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"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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