It works for me. I do not use the WiiM for video, only to drive music and radio over speakers in several rooms. I do not use this setup to watch movies and until WiiM supports HDMI/HDSC multi channel with some kind of AVS device this seems like it cannot be possible - sync will ALWAYS introduce significant delay.
You will need a feature request for a WiiM AVS that controls the delay on the video so that it would match the delay on the audio. But then that WiiM would need to be licensed to deal with video and those licenses aren't cheap, WiiM would have to make a big bet they they could sell lots of units to make it worthwhile to them (5.1 etc is controlled by a cartel that needs to get paid).
But I use this strictly for multi room music and streaming radio and it works. The WiiM syncs speakers in my kitchen, living room and dining room on the ground floor of my house. I have a subwoofer in the living room with its own WiiM mini. It works.
My TV is on the 2nd floor TV room and driven by a Denon AVS. I do have a WiiM plugged in as an input to the AVS. In that case there is another to sub, two tower speakers and two surround speakers but they are all wired to directly to the AVS and treated as a single WiiM in the sync setup. The AVS is managing room correction and crossover in that case
In the living room in the ground floor the sub there is directly fed by a WiiM mini and synced with other speakers in the same room that are driven by a wiim pro.
