I've learned a lot from this thread! Thanks to all contributors.
There are some companies that don't have Out-of-Network coverage. For example United HealthCare says that with their 2015 Exchange plans, you are either in the HMO network, or you are "not covered".
It sounds like in many regions, it's best for the client to bite the bullet and pay an additional $100+ dollars to stay in a PPO, because the extra headaches and costs of going out-of-network will negate those premium savings anyway.. if they need to use the plan within the first year or two.
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On the UHC plans, its important to learn if you are selling the Choice or Navigate networks OFF Exchange vs. Choice/Navigate PLUS.
This is critical. If the word "plus" is not included, there is not an OON benefit (excluding emergencies).