We were on this sailing as well. Ship and cabin were great. First time on Harmony. Our check in time was 10:30 and our traveling friends had an 11:00 time. We arrived about 10:50-11:00 and the line was a bit crazy. Nobody checking times.
Once on board, the only line we encountered was at My Time Dining. We had reservations for 6:30 and the first evening we were seated about 7pm. After that, we just checked to see if our table was ready and walked in. Lots of open tables available, just not enough staff, in my opinion.
Great ship and beautiful weather.
Oasis next in November!