Greetings fellow Weber fans. I am in the market for a new gas grill, and I have narrowed my search down to 2. I am looking at the Spirit E-310, and the Spirit E-320. The only difference is the 320 has a side burner and costs $50 more. My question is, how many of you use the side burner, what do you use it for, and is it worth $50 more? Thanks for the input.