I've always liked the 510 but looking at this new version, I'm excited to see an updated microphone design. The 510 WindSmart technology worked great but was average on style. http://www.allaboutheadsets.com/

The only negative thing with the 835 is as Scott mentioned, the lack of extra eartips with the headset. And the reason that you don't get any extra eartips is because they were not meant to come off and be replaceable. So that is about the only bad thing with the Voyager 835, and the same with the Voyager 520 & Explorer 370... that type of ear tip and ear loop is made onto the headset and is not replaceable. But other than that... The 835 is a great looking headset. It's very lightweight and the sound quality is actually pretty good. Not only is it a good looker, but it's also a good performer! I'm not sure if it blocks out quite as much background noise as the Plantronics Voyager 510, but it's certainly a lot sleeker looking and not as bulky. Another cool feature is that the Plantronics 835 has multipoint technology, this lets you pair your headset to two different devices at the same time. So that let's me use the headset on my cell and also on my pc for SKYPE (pc must have bluetooth or you need a bluetooth USB adapter to connect to computer). The 835 also has 5hrs of talk time, which is even more than most cell phones. So that means you can spend less time charging and more time using... And that's always a good thing !