My husband and I both have Mutual of Omaha G. We have had very good experiences. They were by far the least expensive G plan for us when we enrolled a couple of years ago and give a nice discount if both husband and wife enroll. The premiums have gone up a small amount each year but we are still paying far less than other comparable plans. I had to call them once with a question, they answered the phone quickly and answered my question efficiently. No problem with the processing of claims.
The only complaint I have is that Mutual of Omaha sends me some junk mail trying to sell me other kinds of insurance like dental, life, etc but I think all insurance companies do that, it is just their nature.