Why Is Chicago Mix a big deal?
Probably the 2 reasons is that the actual flavor combination of cheese and caramel popcorn goes perfect together, and the name is actually trademarked and has a lot of value.
Chicago Mix is seasoned popcorn, cheddar cheese popcorn and caramel corn popcorn mixed together. It's actually trademarked by Candyland in St. Paul, MN. According to their website, co-owner Brenda Lamb mixed the combonation up after returning home to Minnesota from a candy show in Chicago in 1988. Candyland patented the term Chicago Mix in 1992 and it's their most popular flavor. The fact that Candyland owns this trademark is a very big deal since big popcorn brands nationally, and locally in Chicago were using the term Chicago Mix for a while. Candyland was able to successfully defend its trademark in court which made everyone using the term have to change it. Imagine owning the rights to one of Chicago's most well known snacks, and not even living in Chicago. Here's an article from the Chicago Tribune about it. https://www.chicagotribune.com/business/ct-garretts-chicago-mix-1218-biz-20141217-story.html
If you read the articles, Garrett Popcorn Shops and G.H. Cretors Popcorn are really big names in Chicago popcorn and battled to keep the well known snack name.
Candyland's Chicago Mix has seasoned popcorn, cheese popcorn, and caramel corn mixed together. Garrett Popcorn, Mother Butter's Popcorn, G.H. Cretors use just cheese and caramel in their style mixes. The overall theme is the strong cheese, and gourmet caramel corn mixed together. Some add butter popcorn to the mix. The Chicago Mix is popular and seems to have opened the door to companies trying all different types of flavor combinations. Bottom line is Candyland was genious for trademarking the term that is still gaining popularity today.