Sennheiser's MX W1 wireless earphones are truly exciting because they provide a glimpse at what I hope is the future of wireless audio: Kleer technology. For the first time, Kleer's wireless audio technology has been implemented in a quality product. (RCA was the first to use Kleer in its S2501 Jet Stream MP3 player last year, but it was a poorly conceived product with such lousy earbuds that there was no way to tell whether the technology behind it was any good.) The verdict: Kleer sounds fantastic with the MX W1. I'm convinced that true audiophiles won't be able to tell the difference between these and wired earphones. Sure, at $600, they're much too expensive—and that's part of what keeps us from giving them a higher rating—but here's hoping that more manufacturers follow suit and that Kleer takes off.