DTS Playfi wireless is a multi-brand (Paradigm, Definitive Technology, Martin Logan, Arcam, etc) group of wireless, speakers, amps, pre-amps, soundbars, etc. that go head to head with Sonus. A LOT of these components are marked down 40% to 90% off! You can mix and match different vendors just like in a wired setup unlike Sonos.
Most of these speakers are ACTIVE so you get a lot for your $$$. The Paradigm lineup even includes ARC room correction. If you have a traditional system you want to take wireless look at the Klipsch Gateway preamp on Amazon for $25. With that hub you can distribute multiple wireless active speakers from a lot of vendors throughout the house wirelessly. Check it out!
If anyone is already using DTS Playfi feel free to chime in.