I've worked with Paynes nucs, Thornes' Everynuc, Thornes' Stehr nucs and most recently Maismore nucs ... all polystyrene. The Maismore ones have lug supports and bee space and look more or less identical to the new one Prakel was telling us about, aside from it being able to be split into 2 x 3-frames. I like them. Squashing of bees can be avoided.
Paynes' built-in feeders are a pain ('scuse the pun!).
I have top feeders for all nucs now and prefer those, such as Maismore, with two troughs around a covered central slot for bees to come up to feed. I drill one side with several holes about 15mm circumference, as near the centre as possible, so I can place fondant over the brood nest in winter, if necessary. This works very well, the plastic covering of the fondant helping to prevent cooling of air rising from the bees below.
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