I don't have a clue as to why people don't like Circle Y's, I absolutely LOVE mine!
I have the Expedition Flex Tree 2 Trail saddle, and I've had it about 6yrs(still looks new-ish too!) Circle Y Saddles - Expedition Flex2® Trail Saddle
It is the only saddle I ride in now, it has me spoiled haha. It has never left rub marks on any horse I have used it on, no dry marks and no sore spots afterwards. Doesn't slide, it is light enough for me to swing onto any horse or carry it long distances, and the leather was soft and supple the day I took it out of the box. We also have a pretty comfortable Circle Y barrel saddle. Maybe I am just biased, but it was the first "real" saddle I bought when I was a kid, made sure to buy it in an adult size so I could still use it, and paid every penny of the $1,800 for it.
I have bought quite a bit of tack from eBay before, all of it has come in great shape and on time. I wouldn't worry about it unless you really don't like the saddle for some reason. You could always resell it or possibly return it or trade it if needed.
People all have opinions, like goneriding has said. I personally don't like King saddles, but my aunt loves her's and swears by the brand, but when I rode in her saddle it was uncomfortable for me. My friend absolutely hates my saddle, but as long as it works for me I don't couldn't care less. You just have to try it out and see if you like it.