Don't look like Yonex top of the range to me. They probably fall under low to mid range. Just plain ugly....
I think comfort and stability , reliable is the 'key'. From the past , shoe with no outstanding looks have better performance..
from my personal experience i agree. but i would like to add that with yonex you really get what you paid for. i have tried a pair of $60USD yonex and a pair of $100USD and there is a big difference. with other brands, not as noticeable.
I've got the current F1 (blue, lightweight) shoes. They are lighter then my 102s, but they don't provide the expected stability etc... Looks like we have to get some more 102s