I got my thumbstick controllers a few days ago. Not sure if I want to use them though. They are quite 'deep', which will make the controller a lot thicker (at least 25mm thick vs 15mm thick with thubsliders). Advantages would be greater incremental control (because of the large size) and mount-ability (come on a PCB with 4 mounting holes)

Precision control can be a good thing while flying multirotors :)