I have had the second half of my first batch of homemade seitan sitting in my freezer ever since I first made it. Although my first attempt at cooking it was pretty good, it wasn't quite like store-bought seitan. In any event, I'll be testing a new recipe soon because I don't see a reason to make the same one again if it was only pretty good. I'm striving for perfection here.
The biggest difference between the packaged stuff and my own is the texture. This time I sliced the seitan pieces into strips, coated them in barbecue sauce, and baked in the oven. Turned out great -- as you can see, we'll have enough of this for another meal!