[dewdcicle]

I've never had one of the one-ear thingies, but I've loved my Motorola BT stereo headsets. I started with the HT820, which has mad battery life, but has been referred to as my 'Princess Lea wig' for reasons obvious after seeing them worn.
Now I'm using the S9-HD and I LOVE THEM. Stereo BT A2DP, AVRC & hands-free phone device. 1/3 the battery life of the HT820, but well worth the sacrifice.
Phone call audio plays in both ears on these devices, but I think it only did one ear on the original S9's (S9-HD is basically the S9 v.2).