They have improved on other nucs in several key areas (wall thickness, material density)
These two qualities work against eachother in some ways...the denser the material the less its insulation value. there is a golden spot in the 80 to 120 g/l density. Softer and the bees chew it. Harder just uses extra material without good cause and raises price.
and more importantly have two key distinguishing features over competitors (the fondant plug and the split design/dual entrance).
Neither of which *I* see as of any value whatsoever. Dual/multiple boxes are fine...IF neither/none fail....but also make you very busy supervising them. Its bad enough in 6 frame and we need to resplit them at least once during the season, 3 frame is full to bursting with one proper bar of brood hatching out. Single free standing units are more flexible in use....been there got the tshirt...ripped out the divisions in multiples or even burnt them (these were subdivided wooden hives into 2/3/4 sections, either 4x2frame, 3x3frame or 2x5frame.
So they cant really be compared to other nucs that dont have these distinguishing features?
The more features some want and others don't sets us apart from the world. If we had a standard design we all used stuff would be half the price or even less. In this country we like to amend the gear to meet the individuality of the beeks preferred systems, other places they use a system to fit the gear. I would happily use ANY of these models, but only one to keep it all the same in my unit.
(i dont quite get the point of a super for a nuc?)
tbh neither do I, if it needs promoted it needs promoted, although even into Sept we make up nucs to use the latest of the queens from the mating unit and usually take them from already full nucs. (we have a system that works by taking one bar of bees and brood from 3 different nucs and putting them in together, then introduce a queen and feed them....works great) Others I know swear by the extension boxes (Paynes ones), and one guy even got at least one extension box of heather honey from each by taking his nucs to the moors in August. if you don't have full hives to spare, don't want to make even more nucs up, then I can see how that can fit in with the system. Anecdotally one nuc producer tells me that they get them going in spring with extensions on, then sell HALF of the nuc as a full nuc, put a queen in the other half, and then have a second one to sell or develop onwards.