This little speaker has won me over. Last year I purchased a W7 and W9 and found it almost impossible to connect to my WIFI and hold a stable connection, and the play fi app for desktop just didn't work as promised, and I had a windows phone cell phone which didn't have a Def Tech app available and so I reluctantly had to return them. This year all of that has changed. The speaker always impressed me with its sound, but now I have a new internet provider, a new router, and a new android phone and I have to say it works absolutely perfectly now. I have not had one hiccup in the wireless connection, the Def Tech android app gets prompt updates and was extremely easy to set up (just as easy as Sonos if not easier) and it's so easy to set up, I'm confident that anyone could do it with minimal tech expertise.
That being said, the app still doesn't have all the functionality that I am looking for in that 'ultimate' user experience, BUT the app has the potential to reach the level of versatility that one competitor, sonos, has achieved, because Def Tech is committed to updating and adding more services as time goes on. I'm a google play Music subscriber ($10 a month works with google cast) but it's not available in the Def Tech app yet, but using the Play Fi app for windows 10 desktop I can stream my google play music app from my browser to the def tech speakers. It's not ideal for ease of use, but it is a great work around in the meantime. Pandora streaming is great and media server streaming is great and easy. If my life wasn't already so entrenched into the google music infrastructure I would switch to DEEZER which is a great app that has the ability to stream loss loss-files.
I also have to say that I'm a big fan of the new white finish available on the W7. I'm looking forward to Def Tech bringing a white finish to the W9 so that I can have a full matching set.
I highly recommend this product, especially if you have an android based phone.