From my experience with this program:
- small index file size - about 10-20 MB on 200GB hard drive filled about to 80%;
- low system resources consuming (VG implements a system not of constant full base reindexing, like Google, but of updating infromation only if file or folder parameters are changed);
- indexing process on my PC takes ~2 minutes;
- handy, simple interface, hotkeys included.