anyone used Ozeroute from cdg to Paris?

Do you mean the bus or private shuttle?
I've never heard of the bus or car service, and the cheapest private car is more expensive than a taxi that will take you to your door, too.

The official taxi stand is your most reliable option. They are always available, it's fixed price, they can use restricted bus lanes. Write down the address where you are going to show the driver if you don't speak French. Follow the signs to the taxi stand and ignore all the illegal drivers that may solicite your business on the way.

I agree with Elizabeth. Keep it simple and take a taxi from the official stand. But if you are staying close to it's Opera stop, the Roissy bus is cheaper if there are 1 or 2 of you.

Never heard of that company. They may well just be new, and legitimate. But when I look at the TripAdvisor reviews and see that the vast majority of the 5☆ reviews are first time posters, my spidy senses start tingling.

I agree with Elizabeth and CJean. Take a regular taxi, fixed-rate.

My spidey senses are tingling, too !

Ozeroute offers a 17€ shuttle bus that goes from CDG to Gare Montparnasse and a private transfer for more than the cost of a taxi. So unless you are staying near Gare Montparnasse, it makes no sense. You may find this thread useful or maybe PM the poster: to see what they did: https://community.ricksteves.com/travel-forum/france/has-anyone-used-ozeroute-from-cdg-airport. I'd take either a regular taxi. Reviews for Ozeroute that I have seen are not good. The one person I know personally who looked at it did not follow up because the drop off spot in Paris was not convenient for her.

Yes, i want to go to Montpernasse. I dont want to spend $50+ on a taxi. Let's see if someone has actually used ozeroute.
Thanks for the info