My experience with fast track has not been all that positive especially when I added additional pieces to a complete oval that came with the Harry Potter set I received as a gift some years ago. The original oval worked well enough thought in terms of looks the plastic bed leaves something to be desired. The real problem started when I added additional track and I ran into a couple of problems. In some cases it was difficult to fit some of the pieces snugly together. The result would be voltage drop-off. To go to the lengths some of the replies above have to go to to get things to work correctly is beyond my patience level, especially when you consider their cost.
I had luckily come into a source of supersnap track (K-Line) and I wound up scrapping all my fasttrack and replacing everything with supersnap (now harder and harder to find). In fact I wound up replacing all the track in my 9' by 12' layout (originally tubular 0-gauge). I have never had voltage dropouts with the supersnap (using mostly 30" and 40" lengths which decrease the number of points where voltage will drop).
John