Depends on what type of feeder you have in mind. If your thinking about an inverted type. The plastic can loose the inverted suction and collapse. If you feeding above the inner cover, this can cause flooding and kill the bees. I emphasis "CAN" happen, but loosing your bees in a faulty feeder just once is too many. I notice that even the heavy plastic bucket type feeders seem to leak depending on the weather. I think is is caused by the hot/cold changes.
I know this is exagerating, but fill your milk jug, and a glass jug with water, and squeeze them between your hands. Think of the cold/hot transitions as doing the same thing as your hands.
I find it isn't worth risking, when you can get gallon glass pickle jars for free from the deli.