My daughter bought me this as she knew I had been looking at it for some time. It has taken a while, but the 2,500 pieces are now in place and it looks great.
What struck me most was the level of detail in every single part of the construction; multiple pieces for the door latches and many areas where everything moves in conjunction just as you would expect with a real engine.
You have to complete it in 4 sections and at no point do you feel lost. It is much more rewarding than a computer game and much less frustrating than a jigsaw puzzle.