Only the smallest cons do one-sided badges these days, but it's very common for badges to have different information on each side. This makes sense, since it can put con policies and emergency service numbers in the hands of every attendee, but it's a misstep when badges contain information that the staff needs to be able to see quickly, such as VIP status. Because no matter how you wear your badge, the wrong side will ALWAYS end up on top.
Rock on, guys, and never stop drawing.