My Prairie Star ripened its first fruit last year. They are small but I thought were a very pleasant sweet mild flavor. I only had three small bunches so didn’t eat a lot. See my post Short Season Grapes for some photos. It is quite a petite plant as well as petite berries. A nice complement to Marquette which I liked a lot as well. Neither as easy eating as the larger Bluebell though. It was an unusually warm long season last year though so it will be interesting to see how they do in a cooler year.
I grew Kay Gray many years ago – they were pleasantly sweet and mild, especially compared to Valiant which was my main grape back then. Made nice juice together. It couldn’t ripen a crop many years and a lot of winterkill so I finally dug it out, but it was much colder and longer cold then than now so I think I will give it a try again. Size was larger than Valiant, between Bluebell and King of North.