One of the things that bugged me about RTM is the loss of the depth effect given by the drop shadows on windows. It looks messy when there are a lot of overlapping windows, since it was more of an effort to discern the window edges.
I resorted to yzShadow, but since that is a win32 utility, it only worked for 32-bit programs.
With the RP theme, the drop shadows are back.
They are not as pronounced as on Win 7, which is what I like.
Now that this niggle is gone, I am enjoying Windows 8 more than ever.
My only remaining beef is that I cannot change the colour of the window title.
I like dark backgrounds and borders, but because of this, I have to lighten up the borders so that the window titles become readable.
I installed the RP in a VM and copied over the msstyles and .theme file.
Modified the .theme file to point to the msstyles file (renamed to aeroRP.msstyles), and was all set.
Good thing I remembered to do this, since I believe the RP expires soon.