Yeah the Isometric series are classic... My friend just bought an Isometric tour 800 from a store that sells original but old stock rackets... its a beauty but unfortunately for me, can't wield it properly... too stiff for me...
Wish I can find an AT700 or AT900... my cousin did manage to buy a "new" old stock original AT500 though... just strung it and waiting for the next play session to test it out...
I'm curious to those who own some yonex ti series... have you tried stringing it at high tension such as 28lbs? Do you think it can hold with no problems? Example ti7 has a warrantied range of just 20lbs