I flew the Ki84 bit and found it to be a great bird. I have always hated the 109's. but I have been flying the g-14 for a few weeks now and had some great fights. Its a fun bird to learn the others are right there is nothing better than getting a 30mm tater snap shot and whatching the other plane explode.
the problem ive had with the spit nine and ki84 is they made me lazy in my acm and E managment, because they are easier to fly. The reason I switched to the 109 was to learns some better acm which it will force you to do.