I hope the OP reports back with the results. I'm not a dentist but the orthodontist I had seemed very sharp (which I don't say often about my experiences with docs) and he had a lot of bad things to say about Invisalign braces. A significant portion of his patients were fixing screw-ups of other orthodontists who used that type of stuff. I wonder if it's gotten better.
Pro Tip #1: Once you finish with braces, don't accept Invisalign retainers. They crack easiky and just don't last.
Pro Tip #2: When you order traditional retainers, make them distinctily yours. Mine are glow-in-the-dark. DH calls them Mood Lighting.
Pro Tip #3: If you choose orthodontia, read your contract carefully. Made sure all-inclusive includes final X-rays, retainers and follow-up visits as needed.
Pro Tip #4: Negotiate. Some practitioners charge for small stuff like re-glueing brackets. Negotiate a small number of minor repairs in your contract, if they're not included. Better still, don't go to someone who nickel and dimes you.
Pro Tip #5: Pay in cash up front and negotiate a discount. Only do this with trusted providers in established practices.
Pro Tip #6: If you have a unique problem, find someone who does lots of it.
Pro Tip #7: Don't go anywhere with the word "Factory" in the name of their business. Don't go anywhere that feels like a factory, either.
Pro Tip #8: Find a provider based on referrals, not on advertising. You can call any dental office and ask who they refer to. Make enough calls and the best providers will emerge.
Final Pro Tip, if you don't want your money to have been wasted, plan on wearing your retainers forever. Ergo, see Tip #1.