That means: Try before, an Osram in the system is a hot tip.
The Phasenjustierschraube with which to fix the flickering theoretically, had no noticeable effect on my configuration.
The plastic looks a bit thin, the connections are somewhat tricky, which is an on / off switch and a bit spongy with my LEDs can be the luminosity even to zero dim (after all, but in about a quarter of full power).
Nevertheless: The dimmer dims now and flicker and for little money, just try with different LEDs, and optionally to attach a brand-LED in the system!