They DEFINITELY have more competition than before, but no other company has built a product line that works so cohesively not only with each other, but with so many different streaming services...all in one app. While the speaker line itself is "ok" (the Play:5 really is superb though), the software is great overall, playing pretty nicely on most platforms. Personally I use it from my PC, my family iMac, my Android phone, and iOS (an iPad). Works pretty great on everything. I use a Sonos Connect to stream music to my high end set up in my dining room for the family to enjoy while eating dinner, with a Play:5 in my kitchen (which I really ended up LOVING),for a seamless experience across the house.
At our house, we use Google Play Music, Amazon Prime, Audible, and Tidal. Being able to search all services in one go for a particular artist, album, or track is SUCH a killer feature. Not sure if anybody else does this?
While I am disappointed in a lack of proper hi-res support for my Connect (something Denon Heos DOES support, along with my Yamaha WXC-50),I have come to accept the compromises for the ease of use for my family. Even my wife loves using the app. We've tried a ton of other brands over the years, and she (my resident layman) loves Sonos and did not like anything else from a user standpoint, and I tend to agree. This is the ace up Sonos' sleeve that puts them head and shoulders over the competition. As long as they can keep this competitive edge (and make the consuming public fully aware of these advantages),they hopefully stand to do pretty well.
MESSAGE TO THE SONOS BOARD OF DIRECTORS: If you guys dare sacrifice Sonos' level of quality, then there WILL be a revolt. The products and software are all made really well. Please keep it that way.