I was looking for a piece to replace my&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Motorola-HS850/dp/B0007WWAGI/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Motorola HS850</a>, which was broken by falling on a hardwood floor. My final decision rested between the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Plantronics-Voyager-510/dp/B0009B0IX4/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Plantronics Voyager 510</a>&nbsp;and Scala 700. Since it was too hard of a decision, I bought both - Scala for me and Plantronics 510 for my wife - since she hadn't previously had one at all. Now that I tried both items, here is the bottom line: we are both happy, as both devices share 90% common features, and both do a pretty good job for noise cancellation. They're both very comfortable (I keep mine on the whole day at work), look very nice - and yet - mine is 20$ cheaper!