Time for a new Bluetooth headset?

I have an older Plantronics Discovery Bluetooth headset that has been working fairly well over the past few years, but it's getting old. I think I got it back in 2007. How much has Bluetooth headset technology evolved and improved over the past few years?

The device that I'm considering is the Bose® Bluetooth® headset Series 2. Here are some of the features of this new headset:

• Exclusive Bose technologies let you hear calls better, even as noise levels change
• Noise-rejecting microphone allows callers to hear more of your voice—in windy and noisy environments too
• Soft, flexible StayHear® tip provides comfort and stability
• A2DP Bluetooth profile enables mobile media content, like music or podcasts, from your smartphone
• Simple, convenient controls make it easy to answer calls
• Choice of left- or right-ear version, whichever you prefer, for best possible fit

I feel a sense of obligation to purchase Bose products since I share the MIT connection, but I wish we could still get discounts on Bose products (MIT grads used to have that privilege at one point). I haven't tried the Bose Bluetooth headset, but I have tried the Bose MIE2 wired headset and I was very impressed by the sound quality (no surprise given that they're made by Bose). If the Bluetooth headset sounds as good, then I may be sold. I'd also like to see how well the noise-rejecting feature works. What's nice about Bose products is that you can test them out for 30 days and get a full refund if you're not satisfied. 

So, how about you? Do you use a Bluetooth headset? If you do, are you happy with it?