The hardware on the soundtouch 10/20/30 series was always surprisingly over engineered with heavy magnets, decent power supplies, and good enclosures but let down by a sluggish app and flaky mDNS implementation.

With this, they just became the best value proposition on the used market. Flashing these with a minimal distro running snapclient (for multiroom audio) and shairport-sync (AirPlay 2) makes them infinitely better than they were on stock firmware. eBay prices are probably going to double by tomorrow morning.