I bought it years ago, but doubt I paid more than $50.
I've occasionally used it as a thesaurus, but the Songguard feature has been my prominent feature. It's pretty simple to upload the details, lyrics, and an MP3 of the song, and then they send you an email of receipt timecoding and assigning a reference# to your creation.
Not that i'll likely have someone steal my music, but this is a basic level of recording the creation.
I don't know if I'd pay $150 for it...