The wheel is quite strange at first: not detachable (always notched), it is quite hard but silent. With practice it is very good for games (less for navigation though). The slides do not cause problems. The drivers are typical of Logitech. Not very ergonomic interface (the dpi setting is frankly weird), pay attention also to the buttons on the left of left-click that change the default dpi stolen, beware of surprises in his game Wire also is more sober than the G502, probably more shielded, but a precaution that is unnecessary and unattractive for use.
The G402 is currently a little more expensive than Deathadder direct competitor Razer home, but it is more pleasant to learn, the Deathadder being a bit too wide in the end. And above all it passed the most expensive and useless G502 for a failed attempt. Logitech is finally back on the market in the form of gamer mouse.