Wanted put in my 2 cent. I have to say that so far I am really loving my stock SB2. It may not compete with extremly high priced transports but it does a good job. I am going to be sending my SB2 for a full mod which should really change the sound.
IMHO, I think the biggest advantage with a SB is the flexiblity you have. To be able to navigate your entire library with one remort Vs searching it is a big plus. I honestly been listening to more music than I have in the last few years because of the SB2. One other great feature is internet radio. Iknow, I know...many of the channels aren't good quality but its a great way to scout for new artist and music.
Also given that SB is open source...there will be always constant updates,upgrades etc for a very long time. Besides at the price point you cannot beat it. New it cost 250 depending on wired or wireless...fully modded another 4-600 hundred...still cost cheaper than most good cd player are sound way better.