I have a very twisty - bumpy - uneven single track Scalextric sport layout, and I have found the one I have, as a good 'track tester'. It's also faster than the 1/32 car's by a full second, doing the circuit in just over 8.5 seconds.
Overall, although very nice, I wouldn't buy another as it's "stuck to the track" and very boring (if fast) to race.
Michael.