Saw this game on Wil Wheaton's Tabletop series on youtube and decided to pick it up for family game night... so glad we did! First night provided hours of fun.  My kids (ages 6-10) were able to understand the concept (although my 6 y/o still needed a little help with names on the routes), they were able to keep track of points easily and were even competing for longest route at the end of the night.