Do electric superchargers really work?

Question:
On ebay, they sell battery driven superchargers. They only provide a slight increase in HP, but they're in expensive. My only concern is, do they actually work? I know vortex generators don't, I don't want to get conned into something like that. I mean, theoretically, they should work since they provide a fuel chip and all that, but I just want to know if anyone has used one, and if it works. Also, has anyone ever seen of these cause engine damage?

Answers:

My 91 buick park ave.is getting power but will not start ,the starter just clicks what could it be?

well if you want to pay that money for .5-1 psi of boost go ahead, most magazines say they are crap and don't work, but i have real boost so i don't need it. I severely doubt it will cause engine damage, just don't expect any significant gains

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