There are few errors in the Paradise National (and from early models which might have changed).
1) A standard excluder does not fit as the Paradise box has curved corners and is a little smaller.
2) The space for a top bar should be just over 17 inches so the top bars can slide. The Paradise space is exactly 17 inches so you can turn a box upside down and empty frames will stay there - in use, sliding the frames is a pig.
3) If you use two brood boxes, there is not a bee space between the bottom of the top frames and the top bars of the frames in the lower box. It's only 3 mm, so bees will be crushed and comb will be built there.
4)The frame runner design is rubbish - bees will always get crushed under them as there is no refuge - you would usually expect to see a thin contact strip as a frame runner.
5) The mesh floor will allow for ventillation OK however there is as much plastic as there is gaps - I suspect that many of the varroa that we would hope to fall through would stay and be able to return to the nest.
As mentioned - some of the points raised may have changed since the early ones were supplied. Apart from that, bees do well in them!
May your bees read the same books as you do.