The soft night guard is legit. As someone who has paid a lot for dentists to make custom night guards, I only wish I had discovered Sporting Smiles earlier.
I originally ordered the hard night guard, thinking it's what I needed I did not like it at all. I sent it back, it got lost in the mail and Evan quickly rectified the situation by sending me a soft night guard, which arrived within two days in the middle of the pandemic in New York.
The team is great and if you have to contact customer service I'd suggest calling them directly to avoid delays.