Went and saw the premiere with my kids (both under 7) this week. They thought it was great, and although the run time was a little short for my tastes, it worked out great for their attention spans. My little one seemed a little bored during some of the slower portions.
The film was visually very appealing, the landscape was terrific. The far away shots of the desert were really stunning as well as the race footage. You could almost feel the sand being kicked up during the race scenes. IMAX was a great format to see this in and my kids were in awe of the size of the screen.
That being said, the acting was a bit strained but hey 2 of the 3 main characters were kids and the other was the horse. And while it may be nit picking, how does a 12 year-old girl start a fire all by herself with no tools or supplies?
Anyway, overall a fun experience to take your kids to.