I think the Arena is a fabulous product.

Best product in its' category, bar none!!!

I've tried a variety of home audio products from a variety of manufacturers including Sonos, Bose and now RIVA and RIVA has far and away the best product line for any home audio set-up

Additionally, Airplay 2 is supposed to support multi-room when Apple releases it, and I read somewhere that Riva anticipates being able to add support via a firmware update (obviously can't guarantee that at this point).In summary, this is a really solid product

It shows that this is a mature product that has evolved over time.