I haven't used the Lightspeed, but I flight tested the Bose X's when my base did an initial purchase. I wore the Bose exactly twice. The first time I used it, I liked it. The second time I kept getting static shocks against my ear lobes. Not very fun. I put my DC's back on (w/ear plugs) and found the noise level to be at or below the Bose.
When I reviewed the test reports, I was one of several users who were shocked. Now, this was back in the summer of 2004. Since then, it seems you either get shocked or you don't, I can't explain why.
Long term use with the Bose found that the yoke that attaches the earcups to the head strap was a high-break item. My squadron sent headsets back for warranty service every month to have the yokes replaced.
YMMV.