No, I couldn't possibly make that claim of 40 hp! So, as for the ad, take it for what it's worth, just someone who knows nada about the chip trying to sell it.
So if you already know what it is and know what it does, here's an ad on ebay
. Also, I think the guy is asking way way too much for a used unichip. Try to make him an offer and tell him that one sold on there 2 weeks ago for 330... And I know it did because that's how much I paid for mine.
Anway, I've got mine installed and I can tell that it has more power, better throttle response and I finally broke 20mpg but I haven't dyno'd it so I don't know any exact numbers.