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You might want to add, that Roccat supported the reverse engineering effort in this case by providing hardware and approving the use of certain sound files:

> The reversed hardware is kindly provided by Roccat.

> The sound files and the Roccat logo are property of Roccat and are used with their approval.

A few years back, I owned a Roccat mouse myself and was delighted to find a decent Linux driver for it.

There's also libratbag, which contains RGB/DPI/extra-button/etc control for a variety of mice from many many vendors

If you want a graphical frontend for libratbag there's piper.

If you only cared about the basic functions, you could have got a much cheaper mouse.

Since when RGB Rainbow became Enhanced Function and dpi/buttons/accel/grip/etc became basic?

Well, since every mouse has dpi/buttons/axxel/grip/etc and not all mouses have RGB Rainbow.

When you buy the mouse with the RGB lighting over the one that doesn't include it