Not personally and as Road said, from what I hear not too many guys here have. Only thing that I have heard might be working is for the flaccid penis only, so if you are into extending what is somewhat pointless, well, at least in my opinion anyway, I don't think there is anything out there that is scientifically proven to improve erect size.
That being said, some guys here have experience using pumps for various reasons. Maybe do a search for those threads as I can't remember the title of it.
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