I have also found that none of the experienced beekeepers have any experience with the Flow Hive (but thus far, they have a universally negative opinion!).
I have decided to get a regular Langstroth hive and if I am successful this summer and they bees survive the winter, I will replace the super with a Flow Hive. It’s such an expensive hobby to start, I want to be sure that I can do it successfully before investing more. Plus, I feel like I need to get a 6 foot fence in my yard because I live in such a dense neighborhood.
I hope that you are very successful, Alexander.