It is a Razer, so there has of course a guarantee of quality. The packaging is perfect, big box, notice, certif of authenticity, even stickers! As for the mouse itself, but it is not absolutely exceptional. It does what it says on the sheet, and that's all. The LED backlight is not at all aggressive, the design is nice (ambidextrous mouse) after the selected material with the mirror edition is of course quite messy. In summary, a good gamer mouse!