This has got to be the best Lego racer ever! I absolutely love this Track Marshall- 8121. I also bought the desert viper-8122 and rally sprinter- 8120. When we aren't trying to mate pennies I will eventually top off this set with the Ferrari racer set, the thunder racer tiny turbo, and Desert challenge. These sets are kinda pricey so they'll have to wait. But on the whole this series kicks butt! Probably the best one. And a bonus that the tracks and cars go together to make a loop. So cool.
Track Marshall 8121:Desert Viper 8122:Rally Sprinter 8120: