7 months ago I bought this Scalextric for my granddaughters, 4 yrs and 6 yrs old, to play with when they visit. It has been a great success. Visiting 6 to 10 year olds also loved it.
None of the children have problems putting the cars on the track themselves, partly due to the magnets that help hold the cars on the track. The cars go at incredible speeds (10 laps in 12 seconds). At full throttle they will fly off, but that is all part of the skill and fun - keeping them on the track so you win! My cars were not damaged when they came off but a couple of cushions strategically placed would make sure there was no damage. I have had no problems with cars being stopped by the track. One car developed a fault and Scalextrix replaced it free of charge.
At 1/64 scale it is half the size of normal Scalextric and very compact, 100cm x 50cm, and so does not eat up the space avialable.
It's important to follow the instructions about set up and do not let the children hold the cars when they are powered up (in an attempt to win!).
I myself have had great fun out of the set by making: two lap counters triggered by two infra red sensors under the bridge, an F1 style 5 light (LED) starter coupled to a £6 electronic stop/lap watch that times 10 or 20 lap races. All adds to the competative spirit.
My 1st Scalextric Set