Sarjan
i took a quick look at the drobo this am. I am a cpu novice but it may be an "apples to oranges" comparison. If i am not mistaken, the music vault seems to be a plug in play with the squeeze box. You would not need a cpu to operate you music player.
In contrast, the drobo seems to be a auto back up storage type device. This may mean, you will still need another box/cpu to rip cds-along with the usual software issues of EAC>Flac etc. Secondly, as such i think you will need a cpu to operate it. Finally, it appears you may also need to add the drobo wireless network unit unless you are using a desktop to attach it wirelessly.
This is not to criticize one unit or another. Just a novice cpu user trying to figure it all out....
Anyway, if sound science does post further, please let us know how the vault is ethernet connected when one has a cable modem>wireless router for their network. Particularly when i believe that most cable modems only have one ethernet out-which goes to the wireless router. In my case an apple extreme which also only has one ethernet input.
anayway. im real glad this thread has become active and glad the audiophile has options....My two cents using cpu >I tunes and a usb dac for a few months in my 2nd system is that there is something holistically different in music from the cpu as opposed to a physical transport. I have neither the verbal or engineering skills to explain it. I do however believe the cpu music sounds less digital and that is a step forward not backward.