I built this for my two sons who, like me, are huge Lego fans. They have all the Amusement Park theme items, including the new rollercoaster. We have two large tables step up as a Lego Amusement Park -- this is great addition to other sets. Like others, my annoyance is the base comes apart too easily. And when it does, you have to take half of it apart to fix internally. After fixing it 3 times (about 20 to 30 minutes each time), I figured out the cause and a found a solution. I've included pictures, basically on page 163 you want to use larger plates, in more locations to keep the base together. Where it says 4x 2X2 plate, you want to replace the lower red 2x2 place with a single plate that is 4 knobs high. With extra pieces I had, I used both a 4x4 for one section, and an 8x2 + 1x4 (for side support). If you have them I would recommend using 6 or 8 4x4 plates spaced out. You might be able to use it on all 12 points, but I was concerned it could cause a jam. After my fix, it has been used dozens of times over the last 4 months (with power functions) and it is still together!