I currently have the shinko tires on my 85 zl9 and must say I am quite impressed with them, especially considering the cost!
At the mid ohio meet this year we installed them and test rode them. Without even warming the tires (about3/4ths of a mile from track) I tried to prove ZLMark wrong about lighting them up and the bike responded with a wheelie so they do hook up cold or hot as they have yet to give me more than a slight chirp.
Havent been in the rain with them as of yet but all else has proven them an exceptional tire.
On my 86 zl i have the Avon Venum and have been very pleased with them as well except for wet traction. They are not as sticky as the shinko as I can burn them off if I want to. They are however a good tire and stick way better and handle better than the metzler i had on the 85 previously and also outperform the dunlops on the 87zl1.
My prefered riding is in the back twisties and mostly agressive! So I would recomend both the shinko and the Avon to anyone as they both perform well. the main difference being that the Avon seems to give the bigger/fuller look and the shinko appears smaller. As well if you do like doing burn outs go with the Avon as they are easyer to smoke up than the shinko.