I have a Fireball and it is really cool. What I like about it is that you have a single integrated UI for both your old CDs and MP3s. I looked for a long time at media servers, own an audiotron, but settled on the Fireball because I did not want to rip all of my 400+ CDs to MP3.
It was pretty easy to set up, you need to know that if you have high speed internet access, it supports HPNA out of the box, if you want to run normal ethernet, you have to get an adaptor. I just use an ethernet/HPNA bridge and all is well.
I have 2 Sony changers, a 400 CD and a 200 CD. The fireball recognized them right away and off it went downloading title, track and covers. It recognized all buy 6 of my CDs. It has cover art for most recent CDs but not some old (over 5 years old).
The only problem is that it occasionally does not see the changers, fortunately a short reboot fixes that and they tell me this problem is fixed in the next software release scheduled for May 1st. The fireball automatically looks for updates and updates itself if it is connected to the internet.
All in all I highly recommend it, one of the coolest devices I own.