To add a little more here. While flying the tree assets should be at their lowest level and not adjust because your flying low. I would not notice a low LOD tree from my chopper, but I sure see the LOD shifting really bad during tree top level maneuvers.

I would rather have lower quality terrain assets than I would see constant popping. If you set your quality to medium, don't display assets higher than medium. The LOD popping looks much worse than any lower quality assets would that were static.

This LOD popping is driving me nuts and I'm set to ULTRA!!

I'd rather have the visual indication, which is quite nice and lose the moaning all together. It should be no more than once per minute at the very least.