Well, since there are no real numbers out there for the SS4400, I suppose you don’t have any?
I currently use the NSLU2, which is really slow, I/O wise. But its enough to even stream HDTV video content, so there is no way the SS4400 can possibly be slower. 😉
I have yet to make up my mind about it, but I really need more storage, plus redundancy. Currently this dev looks like the best chance.
I just read on various forums that the SS4000 series already comes with a built-in daap server (which product could this possible be *cough* :D) – so you might just try to get telnet running (user root, pwd same as the web-admin) and see if you can find a mt-daapd binary 😉