They look like they are compilations of various artists, which suggests to me that the music on them and the sound quality will vary on each disc, and the artists play a pretty wide spectrum of older jazz.
IMHO, this is not a sure thing gold mine of jazz. If you want to explore jazz, and I recommend you give it a try, do it through streaming where you can sample all kinds of jazz at minimal cost and get recommendations for similar albums and artists for the ones you liike.