I've done it and ridden quite extensively. There are some decent climbs on it. With GT rides, you either have to stay with the group or read the map/cue sheet. The group maintains a social pace--maybe 13-14 mph. In general, the GT rides in Bartholomew County are very nice. Randy and Connie do a great job.
Just remember that in a group setting like that, you need to use either voice or hand signals to warn of any cautions, turns and the like. Voice signals work well for a lot of things, but IMO not as well with things like potholes. I know you've expressed some issues with taking one or both of your hands off the bars. If you go, I would suggest staying at the back.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher