Hey Robo,
How do you like yours??
Sorry Peter, missed this post.
I just started with them this Spring, so have no winter experience yet. So far, I have really no major complaints about them, I was skeptical at first, but decided to give them a try on Finsky's advise. Painting was a pain until I started spraying instead of brushing. I do notice more condensation as Michael mentioned. I have a couple that I am using for double 5 frame nucs for this winter. I have upper entrances and the capability to heat if needed.
On a positive note, I am really pleased with the frame rest design, they allow the bees to move under the frame tabs, so no smooshing bees.