I only realised the details after buying the album (which by the way is fantastically packaged as a white boxset and over 4CDs) as it points out on each disc the source of familiarity.
Each disc is themed to present a more enticing way in to the music (Relax At The Movies, Classical Chill (from TV), A Night At The Opera and Smooth Classics). By theming the discs, there is a coherence to what you're listening to, and also the opportunity to indulge different moods (the filmic quality of the first disc compared for instance, or the more evocative opera disc).
I've found lost gems that I never thought I'd own at home (eg the opening music from Trading Places (Mozart), and the music from the Godfather (Mascagni)), and all without scaring me off as traditionally packaged classical music does. I'm definitely going to follow certain composers up after hearing this, it's also going to be a perfect present for certain people in my family, so I can't recommend it highly enough.
