I looked at these a while back, based on the ones for sale they appear to be very fragile. The soundtrack is actually a mini cassette tape which seems to break, and the motion mechanisms are prone to failure as well. Again, that opinion is based on the marjority of the ones for sale having one or more things wrong with them. The only 'perfect' ones were those that had never been displayed. Hotwheels also came out with the Snake & Mongoose Cuda & Duster cars in something like 1/18 scale which were VERY well done and worth picking up if you can find a pair at a decent price. I personally stayed away from the motion version not wanting to pay $200+ for one to have it break on me.
Later, Jim