I've owned this one for 25 years or so, originally on LP.  On LP this one was merely very good.  The sound on the LP was very thin.  The CD has much improved sound quality, and it has several tracks not on the LP. The infamous "Punky's Whips" was censored off the original LP.  "Cruising for Burgers" and "Pound for a Brown" are very different from the Uncle Meat versions and great.  "I Am the Slime" has Zappa doing half the vocals over vampire movie type music and then Don Pardo, the announcer from the original Saturday Night Live, hollering the other half. The added tracks and improved sound make all the difference!