The biggest concern I see online is that people are unsure if they can trust Clear Retain or other online orthodontic retainer manufactures. Personally I'd trust any of them, but I use Clear Retain because, as far as I remember, they have the best price. This is especially true when you "file your smile."
I always buy the "basic" retainer option, not the "premium," and I have no issues with the basic, though I only wear mine when I sleep. One time a new retainer I purchased was too tight, so I ...