Wow, there is indeed a "G" on it!

When Logitech G510s is basically a slightly modified G510.
First, notice that the keyboard only one G, which probably will be for gaming, rather than the brand name appears.
The design is appealing, although the small screen provides nice information, but is not absolutely necessary. In addition, it is more than disappointing that for many years were no further here. Already the Logitech G15 offered a similar display and has now almost 10 years on the market.
Otherwise, the changes are only very marginally. Technically both keyboards (G510S and G510) are basically the same, the materials used and the design of soft, however a little bit from each other. Why you should definitely pay 1.5 times the price for this product in the light of these very small changes but to me not obvious. With the G510 you are equally well served and saves money. In the price range of the G510s one would probably rather a mechanical keyboard and various goodies like a built-in USB hub expected skillfully.

Very good, however like the fact that you can adjust the lighting color of the keyboard individually and for specific games can also hintlergen a specific profile. So my G510S lights when Diablo 3 in red, whereas it enlightened in Half Life 2 in matching orange.

The keyboard allows comfortable writing and playing, although it can hold a candle to any point of a mechanical keyboard as the Razer BlackWidow. These are technical reasons better. So the stop point clear and the reaction is more accurate.

Besides the standard keys, the G510s offers even 18 assignable buttons Gamer (from G1 to G18), as well as several additional keys (Play, volume control, etc.).

The included gaming software is intuitive and offers several configuration options (mainly G-keys demonstrate freely and change the lighting color and manage profiles).
In addition, you can the right Logitech mouse switch provided easily and quickly switch between keyboard and mouse settings. This is really handy and user-friendly.

Conclusion: Logitech delivers a solid keyboard, but compared to its predecessor, yet offers almost nothing new is much more expensive.

My recommendation: Buy the model G510 and puts the rest of the money better in a good gaming mouse, or other PC accessories.