I'm very very interested in this topic as well. Basically, any bluetooth headset will do. Differences are:
+ Noise cancellation (more than 1 mic)
+ Sound quality
+ A2DP (ability to play music, chat on Skype)
+ battery capacity
+ design (you wouldn't want a Jabra Sport for business usage)
+ price (this turns me off)
Beware of imitation to ALL models, especially Nokia brands. Imitation have inferior sound quality.
i asked an iOS user and his concern is battery... naturally
after a round of Google, it seems that Bluetooth 3.0 with Ultra wideband... and Bluetooth v4 with bluetooth low energy (BLE) should solve this issue.
I've minimal usage on a Nokia mono bluetooth i used over a period of a month.
One issue is the lack of Bluetooth v3.0 or v4.0 in the current market.
Anyway, I believe those of us who don't use it for heavy calls shouldn't have a problem