i think the headunit is fairly new, i bought it in january and it was a new model then. but it is not listed in the newest sony mobile brochure
i think it has nice bass, but i can't really tell because i'm running standard speakers

but i have noticed a great amount of increase in sound quality when upgrading from the beta.
can't say anything about the prices as i don't really know the market over there, but compared to how much i got mine for, it looks like a good bargain!
i would advise you look through the new sony models first before going for this one. there's a model called cdx-m8800 which has a buttonless display like this and mp3. plus i think it looks a lot better and will suit the dash better because it's not shiny like ca900.
i hope this helps!