Basic features like turning a bulb on with a set brightness or color (if you’re lucky, you can turn on with a set brightness). No support for scenes (due to matter spec) which can lead to issues sending commands to light groups. And if you want to actually update bulbs good luck because it’s buggy as hell.

I wouldn’t say they’re great; they’re adequate. There’s a lot of issues with the bulb firmware that still needs ironing out both with stability and feature set.