Bit late but I'd also vote for BS nucs if going poly. Good, more functionality than other designs although like anything not perfect.
Feeder is simple and effective although design not 100% perfect - if the whim arises to overwinter 3 frame nucs you can't feed fondant separately.
Ideally should have a divisible crown board included to be able to check the three frame nucs separately.
The divider is a little awkward, even with grooves thoroughly vaselined and lid doesn't always sit very well with it in the middle. As said above, a metal upgrade version is available though.
Personally I like wooden ones more though I use both.