I made the mistake to buy a kama, I deeply regret it.
Yes their's lag and depending of wich game you play it can be very very annoying.
Driving in GodFather became nearly impossible.
It seem that the kama is not compatible with MKW you can even navigate the menu with it.
I also try it with Metroid and Tomb Raider, it'was ok but their's still some small lag that can be very annoying...
Anyhow I recommend avoiding the kama!