Waiting for any comment about Kason TSF 100, 108 and 109

I havn't seen anyone talking much about Kason around here.
I've heard its price is reasonable, low price and medium-to-high quality. So I'm looking for the comments or some more information especially about Kason TSF 100, 108, and 109.

What do you think? And what about when compared with other brands eg. Yonex, Gosen, etc.

Thanks