2 Aussies here that took the Spain tour last September ...do it, you'll only have one regret, if you don't!!
We met a wonderful group of people from the length and breadth of the States, and Canadians as well.
Yes, it was a tad tricky making payment, & the "money" to purchase goods in the Rick Steves' shop doesn't go far when you factor in international shipping costs, but the friendships we made outweighs all that!
Most of our friends at home had no idea who Rick Steve's was, and the joke was..."So, who are you taking the tour with?", "Rick Steves'" we would reply. "Yeah, but what is the name of the tour company?". "Rick Steves'" "So are you having a private tour?"
Don't remember the number of times we had that conversation!! Such a laugh!
Sometimes we had to explain what we meant when we asked for things such as a "roast chook" or other Aussie words, but that only made it more fun, & an education for the Americans. In general, they were very interested in our country, and spent many dinners conversing & comparing attitudes & lifestyles.