IMG acts as a managing general agent for some insurance companies. That means it has the authority to underwrite, issue policies, and also pay claims under agreements with certain insurers. It may also act as an independent insurance broker with respect to other companies. IMG itself is not an insurance company, however.
I've always questioned whether an insurance broker that acts as a managing general agent can effectively represent a policyholder's best interest vis-a-vis an insurance company with which they have an MGA agreement, especially if their MGA agreement contains profit sharing provisions. But that may not be an over-riding concern with consumer insurance that is subject to consumer protection regulations in a well-regulated jurisdiction.
IMG's headquarters are in the state of Indiana in the US, but may also be licensed in other states or countries, so you would want to know with which IMG entity you were dealing. Any US-regulated IMG office should be ok as far as regulatory oversight is concerned, although some states may have better consumer protections than others.