Pros: Friendly staff, knowledge about the phones and services is excellent. Services are reasonably priced. Great reception in the back country - much better than Verizon, AT&T, and other major companies.
Cons: Small Phone company = not in a lot of places. Phones not compatible to transfer files via bluetooth with other companies. Downloads require "Easyedge" which requires a monthly fee, airtime charges, plus the application download charge. Pay-as-you-go plans are also available if you want to download only a couple applications, but more expensive in the long run.
Summary: US Cellular isn't a major phone company yet, so this means that a person who moves to a location where Verizon or other big phone companies are, US Cellular might not be, making the user switch over to a different service. Though the company is great in more remote places that other companies, being consolidated into certain areas makes it hard for a person who moves constantly to stay with the company very long.