I've been here twice. In 2011, they were doing a major loan show on Nikki de Saint Phalle. (She made the signature "Firebird" sculpture that's at the corner of the museum's lot) Although she's not my favorite sculptor, she's important, and it was a major show, including the park across the street. And there was plenty of the museum's permanent collection on show as well.
In July, 2013, they had a clever show, entirely from their own collection, about (mostly dead) artists who had been teachers/students/friends/lovers/siblings during their careers. It featured the entire Giacometti family, Barbara Hepworth, Leger, Calder, and Le Corbusier, among others. These big names are among the works collected by the parents of a Charlotte philanthropist who created the museum.
In 2013, much of the permanent collection (much, much too big to show all at once) on display happened to be works on paper. But they were just as colorful, vivid, and fine as the oil paint and sculpture I saw in 2011. Don't overlook the overhead Sol Lewitt in the lobby, and the Andy Warhol portraits of the Bechtler family by the ticket desk. There's more outdoor sculpture on a second-floor plaza.
This museum is open on Monday, a day when many other tourist sites are closed. It's day off is Tuesday, but since the Mint is now closed on both Monday and Tuesday, you should check the Bechtler's schedule before you go. I got a free reciprocal admission because I'm a Patron member of the Newark Museum in New Jersey. But I thought $8 was fair for the size of the museum. There's a combo ticket option if you're planning to go to the Mint and the Gantt in the same 48 hours.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.