I've been wearing my aligners FOR OVER A YEAR (including refinement months since I was not happy with the results).
I've seen minor adjustments but not straight teeth. My aligners actually CREATED SPACES BETWEEN MY TEETH THAT WERE NOT THERE BEFORE. They pushed my smile out which I'm assuming was to help to crowd, but my teeth are still crooked and have gaps.
I've decided I'm done and it's taking OVER A MONTH TO RECEIVE RETAINERS. They advise you to continue to wear your existing tray but I've had three aligners break (crack) and now I'm wearing previous trays for a smile that I am not happy with. At this point, I'm fairly confident the retainers won't even fit because of how much my teeth have shifted as I wait for them to arrive.
Unfortunately, I feel this has been a WASTE OF TIME AND MONEY. My dentist is concerned with the impact on my gums.
Overall I'm disappointed.
Bottom Line: No, I would not recommend this to a friend