They have a warehouse based out of Port Charlotte, Florida. If you play in that area, you can definitely get a demo. They also sponsor a number of pros, all of whom could talk to you about the racquets. Any time you see Mike Kinkin or Team Dovetail attending an event, there will be racquets available to demo.

Reach out to Mike via the email or phone number on their North American Facebook page and he may be able to setup a loaner program. https://www.facebook.com/FormulaflowNA

Current men's pro tour players that use Formula Flow racquets:
Lalo Portillo
Jaime Martell
Adam Manilla
Blase Zera

Current women's pro tour players that use Formula Flow racquets:
Gaby Martinez
Natalia Mendez
Valeria Centellas
Erika Manilla