I upgraded my grips to Tosten CS-8 grips. I did it during the conditional inspection so I had everything open saving some time. I estimate about 2 days additional work for the mechanical and electrical rewiring.
This grip added selection of radio channels, flip flop, elevator trim, and autopilot, plus trigger PTT. My OEM trim on the dash was changed to a on/off switch that can disable the right seat stick grip functions. The OEM autopilot CWS button was changed to a toggle for the fuel pump, (it stays on during all phases of flight).