Pros:
This theme is interesting enough. It's based on
the theme author, Sigma. It's called "External"
because it's also based on how the author acts. There is
a twin to this set called "Sigma2" or
"Internal" and that one is based on the
author's mind. Interesting enough for you yet? Well, if
that doesn't do the trick, the quality of theme parts
should. This particular theme is full of the highest
quality sounds and graphics. The sounds are more or less
techno and a mixture of several other short sound
effects. The wallpaper is an 800x600 JPG image that looks
like something you would see in a good X-Files theme. The
desktop icons are simple but appropriate 256-color
"sigma" images and the cursors... Well, they
are a perfect example of how just a little creativity can
go a long way.
Cons:
Sound compression.
Overall:
It's original and it rocks!