There are "issues" with the Rose Hive method, but nothing too onerous.
If you want to examine all the brood at every inspection, then there are lots of frames to go through. But I don't inspect all the fames every time. The upper box(es) tell you all you need to know most of the time.
When full, the boxes are heavier the National shallows, but at 25kg are manageable.
When taking a harvest each frame has to be checked for brood.
However, the boxes, frames and foundation are cheaper than Nationals. The queen has more space to lay (no QE) and if she is prolific, very large colonies can result. The extra space and freedom reduces swarming and the incidence of disease.
Using one size of box means that frames can be used and swapped anywhere. Manipulating the brood nest, for example, is easy and making splits is a breeze. Additionally old comb can be rotated out without any special procedure.
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