Perhaps I'm just a sucker for prop replicas. I love the idea of interchangeable parts so you can make your sonic screwdriver just the way you want it. They could release an expansion pack and I'm sure fans would love it! I know they have something similar to this with lightsabers (kinda like a "Build-A-Bear Workshop for Star Wars Geeks) but I've heard that its insanely expensive. At $44.99, the Personalized Sonic Screwdriver Kit isn't that bad of a deal.