I bought it for 47€, so based on that price, I evaluate it and I believe it's worth 47 euros. It doesn't have any delay in response and it also has nice lighting. As for the cons, I would mention that it doesn't have any software for lighting adjustments, that you can only use it wired while charging, and the fact that it needs charging as soon as it reaches 2 bars. However, with the lighting turned off, it lasts more than the 20 hours that the manufacturer claims, while with it turned on, it lasts much less than 20 hours. Otherwise, for 47 euros, I haven't found anything better in this category, but for the current price of 78 euros, I clearly recommend the g703 hero.

Edit:
(Some time has passed)
You can use the mouse wirelessly while charging, so scratch that. Also, the plastic parts have already started to melt, although not excessively... The battery still holds up satisfactorily. However, the scroll wheel often double-clicks when I press it, so it's annoying mainly for browsing when a window opens twice or when I want to close only one and it closes both... It hasn't bothered me in gaming, but it's still an issue... Other than that, I still consider the price to be higher than it should be and I don't recommend it for 55-60€+