I belong to three MLS's, 2 that use Paragon and 1 that uses Flex. Five years ago I was part of one that used MLXchange.
Between Flex and Paragon, I prefer the Flex system, mostly because it doesn't have the lock up problems that crop up on Paragon. And FBS seems to be more responsive to changes and willing to make changes.
One other thing in favor of Flex, they work with a lot of small MLS services while Paragon seems to look for larger systems.
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Broker-Owner Thirteen Years REO Experience
GRI,CRS,CRB,e-Pro
Some days I feel like the bug, other days I feel like the windshield