Does Virgin Mobile have good service in Chicago/suburbs?

I'm considering switching from a sprint iPhone 4 with 3g to a iPhone 5 with 4g LTE, and was wondering if Virgin Mobile has good service/good service around chicago? The map says that all of Chicago is covered, but that is same thing that Sprint says and that is not true!

Consider this:

Virgin Mobile is a prepaid branch of Sprint. Virgin Mobile runs only on Sprint towers and does not allow for roaming.

If you are having problems with Sprint coverage, you will have more issues with Virgin Mobile.

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