I have the newest ZipTips Premier model, and I installed them about three months ago. I did use copper adhesive shielding for the lightbox on the wingtips based on earlier complaints I had also read. The only problem I have is a very faint ticking sound in the headsets when I have the strobe lights on. Itís not loud or pervasive at all, I have a dimmer switch in the cockpit which makes much more noise. Overall, I am extremely happy with them.