I bought the Zen Stream last summer. It was my first and only streamer which I use with a very good dac, the Musetec 005. I use it with JRiver to access local files from my server and stream internet files from Qobuz using an android app called Mconnect. The Ifi app, which is just access an internet, address/portal is limited.
Pros: very good to excellent sound quality. It has responded well to eithernet tweaking.
Cons: for novice streamers like me their is a learning curve. It took some time and struggle to set it up for Jriver. Now that I have it running it has been stable and easy.. You can get support on a Head-fi forum.