No, it is not used. The word "showroom" just means that an iRobot Roomba can be tried out in Digitec's showrooms.

Hi Glaucia.mussi
Thank you for the question. So if you buy the Roomba i7158 of course you'll get a new one. "Showroom" means, that you can see and touch the device in real in the Digitec/Galaxus showrooms.
Best Regards,
Your iRobot Team