My husband and I attended a Six concert with my parents. We were all impressed with the talent of this family act. It was entertaining, but they didn't go over-the-top with cheesy sets and costumes like many other Branson shows, which I appreciated. They sang a variety of crowd pleasing songs and my family was amazed by their vocal abilities. They sound like they are accompanied by a full multi-piece band, but it is all a capella vocalization. They worked in humor throughout their show, some of which was super-corny, but overall very entertaining. I think they could benefit from some help from a comedy writer on some of their schticks.
I'm not a huge country music fan and only go to Branson because my dad loves it. So, a show like Six is a good option if you're not really crazy about the over-produced fakey music extravaganzas.