Went last Saturday and loved it. If you think you'll go more than once in a year and take the whole family, it may be worth loooking into a membership, which gives you free admission. A one-year individual membership was $25 and a single visit for an adult, even with the LVA coupon, was $14.
One of the staff mentioned that the government sold them the building for $1 to build a museum. Since it was on the Historic Register, they couldn't tear it down. Too bad the Stardust wasn't on the Historic Register, so that they couldn't have torn it down to build that eyesore on the Strip.
Even if you will only go once, it's a museum and relies on memberships. I'll probably take out a membership just to support them.
I spent a little over two hours there and could have spent longer with some of the exhibits.