huge fun & good value , we lacked the space for the original track layout , this set + some additional curved track (R3)(C8204) enabled us to make a longer narrower set with this extension in the empty hole in the middle. Fantastic extra track to have if you are "space limited" on what you can build. this lets you fit alot more track into 8ft x 4ft or 12ft x 4ft floor space.
* may need to get 2x 1/4 (87mm) & 2x short straight (78mm)*
to get the correct fit on your track.
best advice use the scalextric "track designer software" to experiment with what you can fit in the area you have to use.