Enter the X4 Aileron, a competing “Designed for Xbox” grip that not only brings a pair of those aforementioned back buttons to the table but also offers surprisingly in-depth customization ...

The X4 Aileron is priced towards the top end of the mobile controller market. However, it’s still cheaper than the Razer Kishi Ultra, which is one of the most expensive models around.

The only other adjustments are a few other minor functions and tweaks to the RGB, ... GameSir X4 Aileron. Razer Kishi Ultra. Backbone One. Price. $99.99 / £99.99 / AU$169.