I'd be at least a little cautious of used Fastrack in some cases. Not so much from people on this forum, but there are dopes like me out there who managed to abuse it to the point where it got kind of loose. Most guys here are smart enough to support it properly, but I ran heavy engines on carpet and beat some of mine up. I've now got a solid surface under it and life is much better, but just keep an eye on it. Of course, the upside of abused/loose Fastrack is that it goes together like butter, and for a real small setup it might not be that much of an issue. I've struggled to connect some new Fastrack; it's not something a kid can do easily. Another tip I learned was to coat the connectors with a little RailZip/DeOxit before plugging them together. It makes a difference in terms of conductivity; more than I would have though possible. It also adds a little lubrication. Good stuff to have around IMO, but then you probably don't want the kids covered in the stuff/having squirt gun battles with it 
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