I'm not sure if this has already been mentioned, but for the holiday I treated myself to "Zappa Plays Zappa."
All in all it think it worked on multiple levels. Once again, most aspects of Frank's music were showcased. Lesser known tunes stood there ground by those considered to be more tried and true. Steve Vai's guitar playing on Zomby Woof is 100% over the top. It is also a pleasure to see Napoleon Murphy Brock perform. He clearly enjoys this music and is, by virtue of the recorded legacy, an import part of a stellar era of Zappa.
Dweezil also is a marvel. Whereas he came on the scene as a shredder, he has woodshedded and does an exceptional job of summoning his father on the guitar. The tone, phrasing, and mannerisms are all spot on. He even uses Frank's signature SG. He never resorts to imitation though, and that is very much to his credit.
Great place to start as far as becoming acquainted with some of FZ's most enduring tunes.