Fantastic service on getting the brood boxes (and frames too). What a crazy year 2023 is turning out to be.
The Swienty boxes have well documented problems. They are not truely a bottom bee space design.
My solution is to convert them to top bee space. Practical for my small establishment of 12 colonies + Nucs.
Probably not practical if you're doing more than that.
Bought as light in weight and will use for vertical splits,as they are compatible with cedar nationals.