I've only put about 100 miles on it, but I've had a speedo prob on all three rides. Cadence has worked fine. It was originally installed at the LBS. He told me they were new and to let him know how it worked. 50$. Yesterday I remounted the sender higher on the fork with a little silicone on it to help hold it in place. Made sure the magnet was in the sweet spot. Had some extra time so I made a plastic piece to mount it behind the handlebar. If it gives me a problem Friday it's going back to the LBS and if it works perfect for the next few rides I'll post an update.