I haven't tried Clearly Contacts yet, because I never find frames I like. But we tried Zenni for the first time last summer, and have had great success. After I got my first pair, DH decided he wanted a new pair, got a pair for my Mom, and my first prescription sunglasses ever. I usually get the transition lenses, but they don't darken enough in the car. Lenscrafters price for my glasses? $600. Zenni's price for my glasses, with bifocals, anti-reflective, and transition? $80. Sunglasses were $40. So the 5 pairs we have ordered so far don't even come up to one pair at Lenscrafters yet. Our optometrist has checked them, and confirmed the prescription is spot on.
Our daughter-in-law just ordered a pair too, after hearing what ours cost. She was quoted $700 from her optometrist, and got them for $70 from Zenni.