My son and I both have this vehicle (not the pro series) and have enjoyed them tremendously. We have started to race them at nearby tracks but, being very new at this are having a rough start. Have not figured out what certain sounds mean, such as a broken clutch spring could affect the tuning to keep it running and so on....We have added on many extras such as larger cooling heads, 2 speed transmission, carbin shock towers, new exhaust and headers, not to mention all the tires we've been through. We love this vehicle and wonder why we don't see it offered at any other Hobby Shops besides the one we use ( gerbersrc.com ) or see it at any of the track we have visited.