The biggest problem you'll find in mini-grains is that the lack of liquidity will sting on you fills. Now you mentioned that you'll be swing trading the market which means you'll be looking for more "moderate" sized moves and not so much short daily swings. This is probably a workable strategy since getting hit a little bit on your fills won't kill your profitability.
The other thing you want to make sure of, is that any market orders you place are done during the "pit" session hours. After market hours liquidity in this area is atrocious.