Can you explain Star Wars Death Star Legos to me, please?

My seven-year old grand-nephew wants desperately to buy it, at $400. He and his little brothers have scores of legos and other flashy, splashy, day-glow, talking and short-lived toys.

He is getting a $5.00/week allowance for chores and plans to save for the Lego kit. His mom says that, so far, he is diligent. However, I have given him $100 for the past several Christmases, to be used, I hoped, for a college fund.

My nephew has emailed me for permission to use his Gail fund for his Legos. I haven’t a clue? Is it worth $400? Will he be sorry in a year? In a year of indentured servitude, he himself will have saved $260.