Like Steve said, a very discussed question. I asked iit myself. I am only a 2 batch rookie and I made both using a plastic (cooler carboy) as my primary. But, I made both batches with frozen juice concentrate, if you were to use fresh fruit, you would need to be able to access the "cap" to press under the liquid each day, pretty hard in a carboy. Most seem to feel a pail type container is better for the primary. I will however respect the opinion of the senior members on here and try to stick with glass or use a type of plastic specifically designed for beer/wine making. One of the first instructions I ever came across about wine making suggested if you are going to use plastic, look for the # 1 or 2 in the triangle(the recycle code) on the container, and specifically said DO NOT use plastic with the 7 designation, and that is exactly what my water cooler carboy is. I'm still pretty new also and don't feel my opinion on this weighs in too heavy, but I would suggest searching this forum on this subject there is actually several discussions/opinions regarding using plastic.
Troy