My wife and I did a Viking cruise to Cuba last week. I knew that connectivity would be spotty and so it seemed like a natural test of our gotenna mesh units. I also took along a Delorme inReach (now Garmin) satellite text device for long range communications.
We used them all the time from the point the tender landed at Cienfuegos, on the bus trip to/from Havana, and during our walking tours. We had very little free time, so we tended to split up when there was a line or a difference in interest level.
For example, there was a huge line to change money at the port. One of us stood in line, the other ferried bags to the bus and other stuff. We exchanged questions about how much money to get, status of the line movement and other info.
We used them in the big Centro indoor arts/crafts market in Havana as we split up to shop.
Because it was hard to hear at times, we would type in times to be back to the buses and other logistics so both people had them.
We even used them in the bus when we were decided (discreetly) how much to tip our amazing tour guide Rigoberto Mali Rodriguez (recommended and on linked-in).
Battery life was no problem. For three days of travel, we had no battery issues. I topped them up at the hotel at the halfway point reflexively, but they would have been fine. We still had two bars out of three.
The only disappointment was that I never got a response to a shout or saw a relay take place. We must have been the only folks with the units in our group.