You will be completely overwhelmed by the store. The fabric is piled up so much you can hardly move around. If you are going to go you need to allow time to go once just to look around and then go away and think about how you are going to attack your buying visit. There is only one cutting table and it is stuck in a corner with stuff all around it so it isn't a quick cutting and checkout process.
The prices are not great. Every piece of fabric has the original price or higher on it - no markdowns once something has been around a while. But they do have an amazing amount of fabric and it is a cool experience to actually visit.
There are two nice shops in Oneonta too, which is only about 10 or 12 miles away by highway. I echo the recommendations about the ones in Dansville and Candor. I would also add a trip to the Syracuse area - there are three great shops there. Two in Syracuse, one in Marcellus.