First off, I am bummed when exclusivity makes it nearly impossible to find the version of a film release that I want; In this case, Best Buy has the only 3D release of the newest Kung Fu Panda series entry. Good for Best Buy, I guess, but not great for consumers, since then there is no price competition, and anyone who still likes 3D in home theatres (likely people who bought into either the LG or Vizio FPR passive 3D TVs, with Vizio having stopped 3D compatibility as of their 2013 year models) will know that 3D versions are often the least likely to get a price cut anyway. So, bummer on the availability.
As to the movie - If you like Kung Fu Panda, this is definitely a worthy entry in the series, with some very amusing, if a bit juvenile writing, and some contrived bits to make this storyline fit. I found the picture quality to be delightful, and the sound similarly good in quality. The style of the art did make it harder to easily recognise that some of rendering has improved in some big ways since the prior two films, but was a refreshing change, and was used well to present flashbacks, and other important events that were presented more by narrative.
Overall, a fun film, with good blu-ray quality, fantastic 3D (if that matters to you at all), but not quite the best pricing due to exclusivity in release versions. I would recommend it highly to anyone who liked the earlier films, or wants fun 3D that isn't too excessive but still has good depth (much better depth than out-of-screen effects, thankfully) and vivid colours.