Besides their sturdy construction, it was the Spectraflame colours that always attracted me - the wonderfully vibrant cherry reds, magentas and antifreeze greens always outshone the more staid and conventional Superfast cars.
Decades later, the classic Redlines still command good prices on the aftermarket, even for really beat up examples, although occaisonally bargains can still be found.I'm working my way through the early catalogue to try and get as many of the original 'Sweet Sixteen' release and the subsequent years more exotic examples, such as the awesome Noodlehead, Bugeye, Peeping Bomb and the three 'T's - Torero, Twinmill and Turbofire!