We visited the museum today and liked it. In particular, the temporary (photography) exhibit - "Bearing Witness" - was superb. I'm very familiar with the photos and I've met two of the photographers (who are in their 90's) - but regardless; the exhibit was a real highlight, and it also included a short portion of a wonderful documentary. The rest of the museum had some interesting items, and I particularly liked some of the ancient statuary & the costumes.
Note that admission to one of the Mint Museums gives you free admission to the other one. Also note that AAA members get a $2 discount - but if you're with someone else who also has an AAA membership (such as a couple, whereby you have a family membership), be sure to pay for separate admissions. When we showed my husband's AAA card, it turned out that we were only given one discounted admission - so then we had to get a refund & get two separate discounts (i.e., by also showing my AAA card). It also turns out that tax is charged on museum admission (we were told that's a recent development) and therefore the AAA discount essentially just covered the tax.
The woman at the ticket desk and the woman in the gift shop were both very friendly.