I usually do not pay for software. I use open source software. I use Amarok on my desktop and I have never seen a media player more polished than Amarok. Canola as you said is still an immature beta (very definition means unpolished). Amarok is just an example. I use free (as in freedom) polished software all the time.
This is precisely my primary concern. A media player has access to a lot of private data. Whats behind the closed code worries me from using Canola? What are the coders hiding in the parts that are closed? It also raises doubts because only part of the source is open.
My feedback on the usability is also real. I have not made them up. You can see the same issues raised in these forums by other members. All in all I am going to stay away from Canola.