I bought to use a stereo
Bluetooth headset (A2DP, the works), planning to hear the sound from the PS3 while you play, to avoid seeing for a few long audio cable for my normal headphones.
Bad news: the headset works, but it is only used for phoning, not for the actual music or sfx of games.
Which is something I had not seen mentioned anywhere, and was chasing me around for a while. I finally saw it as a side note in some FAQ in some forum. So I hope this helps anyone before purchasing his / her own headphones.