Most insurances don't pay much for dental, so I was looking for something better than FedBlue alone.
Checking with the billing folks at my dentist's office made up my mind to go with GEHA. We've had GEHA for 3 years now, and we are satisfied.
We found vision insurance to be a total waste of money. Sticking with the optometrist recommended by our family doctor that we liked and using online or WM for glasses was a much better deal.