Trees
Pros:
* the density of the forest has greatly increased the dangers and intensity of low-level flying. More than a few occasions I've been punished (and rightfully so) for attempting unwise, super low level flights.
* looks great. The feeling of 'canopy lines', as compared to terrains without trees, is a definate improvement.
* bombs now fall through the canopy.
Cons:
* California Redwoods? Sequoyas?
* Some people are experiencing frame drops(although my old machine has no such problems whatsoever..)
* A lot of misplaced trees. Especially too close to the runway.