Extract brewing, which is how most homebrewers get started, can be likened to baking a cake from a cake mix. All-grain brewing, which is how breweries make beer, is like baking a cake from scratch. All-grain brewing is more time-consuming and requires additional equipment, but allows you more control over both the ingredients and the brewing process.
I have been curious about the effect of fermenter material on the flavor/fermentation of beer, but never did a controlled experiment to determine whether it actually made any difference. Until now!