For the Sigma 16:12 I am because of the good feature set, and chose the display illumination. This is especially in the dark a total useful extra!
The 2 in 1 funtion is the use Highly Recommended with 2 wheels.
The installation is simple, the operation with 4 buttons take some getting used. But practice makes perfect;)
We do not need to talk about the price!
All in all, I recommend this product to all who do not interfere in a Kablel.