Bests & Worsts Reviews from Amazon

I thought this would be a great toy to get some more play out of all of the hotwheel cars we already have in our household. I'll start off by saying that my kids (7&5) are having fun with this toy so far and it has provided a couple of hours of entertainment for sure. But I have to give it 1 star only -- having tested it with about 20 different cars, only 1 or 2 cars can make a complete loop on 1 of the 2 loops, and on the other loop almost no cars can complete the loop (they either fly off or fall off, even the car that was included in the kit), so we have not been able to really enjoy the "crashing" element of this toy. So I think that the kids are going to become quickly bored of it. As other reviewers have mentioned, that is basically the only function as it does not easily allow for customization or other configurations. Aside from that I think that I agree with other reviewers that it wasn't too hard to put together, although I did it instead of the kids. Overall I am thinking about returning it for a refund. I'm also disappointed in the other earlier reviewers who generally all gave it high marks, but they are almost all out of the "vine" program where they are sent the product for free in exchange for a review. Going forward I will be reading those reviews with a much more skeptical eye and I would remind those vine reviewers to please give us a true unbiased view of the product. Please help those of us out who are spending are hard earned $ to buy these items.