I'll confirm this too. I haven't done the firmware update yet, but after updating the go 4 app on ios, my sport mode seemed less sporty, for lack of a better term. I didn't actually notice this until I got way out over water circling a boat and got a strange obstacle avoidance message despite having OAS turned completely off. The bird stopped, so I switched right away to sport mode to bring her home, and it was like I was in regular mode almost. Slightly faster, but even with the stick pegged she didn't move like I was used to. Could be my fault for straddling updates in the app and the firmware, but I did notice this too. And it was slightly unsettling.