The viewer works fine here except in the case of the skyline. For example at night there are no stars, though it does get dark. There does seem to be a slight speed increase in texture rendering and better texture handling. Though I am not certain as more testing is certainly needed.
The only complaint I have is that after I installed the First Look Viewer the standard viewer was lagging giving me very large sim PING. Took me a few to find that for some reason it turned on the AGP setting in preferences. After I turned that off all is well again with the standard viewer (client).
Oh I did find it interesting that the cache setting now allows you to set a specific cache size rather than just selecting one of four sizes. This could be helpful in some circumstances though more testing is needed to determine that.
-DB