I would expect bluetooth to work. The interface is entirely different.
I guess I was just spoiled with the setup that came with my Nokia N97. The wired headset allowed you to use whichever 3.5mm jack headphones you wanted, and had controls for volume, next & previous, pause/play, stop, and phone answer/hangup. Plus a lockout switch, microphone, and antenna for FM radio with RDS. When I tried it on the Captivate, I had sound, but it was very hollow and about half as loud.
I also learned that when you unplug the headphones, the music automatically pauses and the virtual 5.1 surround, if enabled, is disabled and has to be selected again after connecting the headphones.
I do like the design of the stock Captivate wired headset, but the low end frequency response just isn't there. Seems like anything below 150hz is inaudible. I'm still using the earbuds that came with my Pioneer Inno portable XM radio and they're my reference by which I judge all other earbuds. I'm not sure what company made them (maybe Pioneer?) but they are the best ones I've used yet. Granted, I haven't tried anything from Shure, Bose, or the like.