I use a fibaro RGBW (FGRGBWM441 RGBW Controller) with openzwave2mqtt and Aeotec Z-Wave Stick.
But I experience some problems.
The device does not report its state. So I dont see if the device is switched on when I press the manual switch which is connected to the fibaro.
And I also cannot toggle it from HA. I can only dim it to toggle it on and off.
I understand the Z2m has challenges getting RGB devices working. Someone needs to debug the issue (it’s on the Z2m github issues list) or send him a device he can test with.