Been brewing since '85 Started with all glass, then about ten years ago, making 11.5 gallon batches, started using 7.5 gallon buckets stacked one slightly offset on top of the other(to avoid the airlock) to ferment in a fridge for Lagers. Secondary though in SS kegs in the chest freezer. Never had a problem with infections or off flavors. Just real carefull not to scratch, cleaning soak with bleach, wiping with paper towels, rinsing, bleach soak again if neccesary, then sanitize with iodophor or my favorite, Star San. Not had a problem ever with plastic. Still use glass with most Ales though.