... ok, I went to see this today and I can't hold in my thoughts any longer.  I loved this movie!  I admit to having my doubts to the way the movie would be done, especially about not seeing the actual Mach 5 in action but boy when I got in there, all my doubts proved to be unjustified.  The movie looked beautiful yet surreal... kinda like the way I feel when I watch an episode of the Speed Racer anime. 

I felt that they successfully updated the movie and brought the technology forward appropriately.  This movie was flat out gorgeous and the racing scenes were beautiful but what I loved the most was the cross country part that brought the Mach 5 to life... I finally for to see a live action Mach 5 roaring across the screen in classic Speed Racer form!  It was awesome!  Can I say that enough?

In any case, I recommend this movie as a fun and heart racing movie.  One word of caution, if you are prone to motion sickness, you might wanna take something before watching this movie.  LOL!