With the 12-button option, the lowest row of buttons (1, 4, 7, 10) required my thumb to be rubbing against my desk surface to press them. Also the fact that it’s an even, symmetrical array of buttons with only a slightly varied angle on every other row makes it difficult to quickly locate a specific key to press without feeling around first.

https://www.amazon.com/Razer-Naga-Trinity-Optical-Interchangeable/dp/B0788MCRGC