Versions are very similar.. but most of the really good stuff has been added with version 3( personal opinion).. ANYWAY.. Carrara Studio 3 handbook is a BIG plus.. I have had it about 2 weeks and it has more than paid for itself!! I highly recommend going to Bizrate or Pricegrabber .coms do a search on google or yahoo..and shopping around, you can save up to $15 on it.. get a wide selection of shippings.. etc, but be carful.. and read the reports on each store... some have VERY bad service (though on a book... what kinda service do you need?). hope it helps :)

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Hexagon, Carrara, Sculptris, and recently Sketchup.