I actually love this media server. It allowed me to migrate all of my movies, music, and picture to my big Mac. Coming from several years of using Mediatomb (which seems to have stalled out)...and having tried a few other media servers...Serviio provided everything I needed to stream my collection to my PS3.
Granted, there were a few moments when I thought it was not working. But, after waiting a few minutes for it to complete the initial startup, and then adding all of the media folders...a little more waiting for the initial database creation and imports, and Serviio works flawlessly. This server can stream every format I have and just is not slow about doing it.
Features are at 3 stars, only because I think that the Console and Server should be one application, or at least have the Console be able to launch the server in the background without the need for two Application bundles. Added to this, I think the Console should have a Dashboard for statistical viewing, as well as, the current status of the server, ability to start/stop/restart the server daemon. There may be others I have thought of or will think of...but the above really would make this a solid media server capable of all 5's.
As for Value and Stability...they got 5's because, face it, how hard is it to install a Mac application. And with a little patience and understanding, setting Serviio up and getting it on a network capable media player really is very easy. Other settings are very easily understood...in other words, self-explanatory. Stability is easy to explain...5 days uptime since install and initial setup and not one crash or restart needed. I did see the server app icon go un-responsive, though the actual server operation was unaffected and within a few minutes the Icon recovered without human intervention.
In comparison to PS3 Media Server...in my opinion, Serviio is faster, easier to setup, and actually works. My brief experience with PS3 Media Server was painful, as everything I tried to stream or view from my PS3 came across jerky, slow, and took several seconds to minutes for images to clear up. It was not what I expected at all...and it really makes me happy to have found Serviio.