I've been there 3 times now.
Great museum, a casual walkthrough for us was about an hour.
The store was also great. Nice selection of Zippo, Case knives, and other stuff (t-shirts, stickers etc).
If I remember correctly, their prices were slightly below MSRP but they have a clearance case that has a lot of nice deals. They also stock most of their product line.
If you're going out there, not too far from Case is the Kabar/Cutco museum and store.