they work OK - I built the Spitfire wing with the jig - it came out "relatively" straight - built in two halves and joined. If you are building a straight wing, do both halves - then re-insert the rods back into the wing centres and join them - the will line up prefectly..........getting the rods out is easy as well- just twist and push them throught to one end and pull them out.
From what I hear, all Brodak kits will have the laser cut holes in the ribs for this jig in the future