Hi I'm Twistopher a AFOL from Upper PA in the USA. I bought the 7939 Cargo Train this past Friday night and have longed for those old 9 volts over the years but when your a kid and money is tight and your vices long (books, music, movies), well I went into a dark age lasting from the mid to late nineties til 2008. It took me a day till I opened the set and two days to complete (Saturday night and Sunday morning). Was it worth the money I spent? YES!!! Only thing i'm disappointed with is the PF controller, It fits in the palm of my hand, it makes me feel like a giant. Otherwisw PF works fine and even the flex track works pretty good.