Canon is an excellent starting point for new Ani DiFranco fans, but is by no means a complete "greatest hits" anthology. When creating this compilation, Ani chose songs that she has enjoyed performing over the years. The selected songs are not necessarily her biggest "hits". So although most of the most popular songs from her early folk-rock period are included, several fan favorites (Anticipate; Out of Range; In Or Out; Not A Pretty Girl; Angry Anymore; Swan Dive) are notably missing. From her later "jazzy" albums, again she omitted fan favorites like Evolve, Modulation and Recoil (which she rarely performs live but is her top ITunes download off her Knuckle Down album).
As for the five song "remakes", Both Hands and Overlap are awful when compared to the exquisitely beautiful originals. Shameless is interesting in that this is Ani's trademark rock-out song, but this version is played by just Ani and an electric guitar, sans drums. You can hardly tell that the other instruments are missing until the drum solo section (which is now a guitar solo). I found both Napoleon and Your Next Bold Move to be acceptable remakes, but unremarkable. Ani has done several other, better versions of Napoleon.
In general, the remakes were disconcerting to me because I'm not used to hearing Ani play an electric instead of acoustic guitar, and she sings the remakes in an unusually high-pitched voice (not sure why). Of the 5 remakes, Shameless is the most appealing, and I really hate the new Both Hands. Oddly, Ani's 2007 Canon tour featured a new arrangement of Untouchable Face that's fantastic and superior to any of the remakes on the Canon album. On her Canon tour, Ani's actual live performances of the "5 remakes" are both different from and far better than the versions on the Canon album.
As with all the recent albums from the Righteous Babe, the CD packaging (with complete lyrics and liner notes) is excellent and the sound quality is superb (My early Ani albums were on cassettes not CDs, so I may be comparing apples to oranges). So, Canon is a great compilation which provides an overall feel for the breadth of Ani's music, but should be treated as a starting point and not a comprehensive "best of" collection.