Have seen all 4 of these movies many times. My Dad wanted Key Largo and this dvd was the best choice cost-wise. I can't speak about the quality of the movies or sound because I don't have the discs. If they're like the other collections then they should be fine.
The movie is entertaining in its own right, and representative of the era in which it was produced, but, aside from the legendary interaction between Bogart and Lauren Bacall, there are only moderate reasons to recommend the film.