I have not personally, but have asked 6 or so friends about their trip(s), and all have said the trips are expensive but first class and well executed. The indication was they would do it again , and some had taken more than one trip.
I went on one a few years ago with my mother. I was a little hesitant as it was my first time ever doing an organized tour like that, but we both loved it. Even with all the group outings there was still plenty of down time where we were able to do our own thing. Accommodations and food were great. I would absolutely do another trip with them.
We were able to book our own flight that was different than the one on the trip itinerary. May be worth a shot asking them if they are flexible on those things.