I have 16 hives and all made it through the winter. 4 of those hives are top bar hives. The best part about it is that the 4 TBH's are looking the best by far! One hive is currently building comb on the last 4 bars in a 4 foot hive and is pulling in massive amounts of maple nectar. Another hive is about three quarters full and the other two are doing very well but not booming like the other two. All four have queens I raised last year. I inspected all of them yesterday and there are no signs of swarming.