Black Box RF 4B/C/E Phantom conversion

Has anyone used this kit with the Hasegawa F4E and is it any good?.

I used it on the 1/48 scale Monogram F-4C/D. It took a lot of filling, sanding and time to get it to fit properly. I did not try it on a Hasagawa kit but if it was made for that kit, it would fit better than on the Monogram kit.