I purchased the HS850 to replace my corded headset on my RIM 7250 as Motorola is the only manufacturer our company supports for 128bit bluetooth encryption. Here in NYC, this HS850 performs horribly. Since the speaker sits on the outside of your ear instead of inside, it's very difficult to hear what the other party is saying. 90% of the intended use of this headset was for my daily walk from the upper east side to my office in midtown, generally a 30 minute walk to which I'm on calls the entire time. I also hear a crackling noise, which I'm guessing is the headset. My car, which has bluetooth capabilites, does not crackle when I'm connected and on a call.With the oem corded headset, I was able to hear, but did not like the fact that I was connected to my phone. Now that I'm wireless, it's just too bad that I can't hear a damn thing!On the flip side, when I'm outside of the city on weekends, the HS850 sounds great (minus the occasional crackling noise). Some have even commented how much better I sound now when compared to the old corded set I used to use.I really wish someone would get it right. Stylish, compact, and loud. Is that too much to ask for? You'll see my unit on eBay shortly.