Disk space getting cheaper, and I'm glad if I can fill them to 50% with good content, rest of 50% is better kept empty (if SSD). Still, Flight Simulator sized downloads are scary, luckily I don't like them.
"Storage: 150 GB available space"
http://forums.larian.com/ubbthreads.php?ubb=showflat&Number=677277#Post677277This doesn't mean the game takes up 150GB, just that needs at least this much free space to work, like decompress and run (and even more free space on the drive if this is installed to same drive as Windows, for future Windows growth and temporary stuff)
