Is http://felixbruns.de/iPod/firm... safe to download the iPod Touch 3.0 or should I just buy it?

I've been looking through iPod Touch 3.0 questions and I have found this site on almost every single one http://felixbruns.de/iPod/firmware/. I have the iPod Touch 1G and I am wondering if I should download it for free or if it would be safer if I buy it.