The short version -- I liked the kit. Hasegawa has engineered this kit well.
Now, the details.
History
The final and most built series of the Mitchell, the B-25J looked less like earlier series, apart from the well-glazed bombardier's nose of nearly-identical appearance to the earliest B-25 subtypes. It had the forward dorsal turret and other armament and airframe advancements. Also produced was a strafer nose first shipped to air depots as kits, then introduced on the production line in alternating blocks with the bombardier nose. The solid-metal "strafer" nose housed eight centerline Browning M2 .50 caliber machine guns. All J models included four .50 in (12.7 mm) light-barrel Browning AN/M2 guns in a pair of "fuselage packages"; conformal gun pods each flanking the lower cockpit, each pod containing two Browning M2s. Total J series production was 4,318.