I tried it for a bit, but for my purposes it didn't add any value. They may have French records that Ancestry or MyHeritage don't.
I also just logged in with my free membership for a quick look. You can do searches and it will tell you what features need a premium membership. If you want it, it's only $12.50 for 3 months.
It seems many users are European, so if you like to look at other people's trees to get ideas, you'll have a different perspective.
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Phil Karlin
Hartford, CT USA