As far as flavor is concerned, I honestly don't get much flavor out of Japanese adjunct lagers. I'm always a bit perplexed when people want to clone them. I guess it's just a challenge that people want to attempt?
I buy very little commercial beer, if I want a particular style I will brew it. My interest in rice lagers though is/was more to see if rice would help with the chill haze I seem to be plagued with for the last couple of years. I know I can fine the beer but I prefer a more natural approach.