i work at a very reputable salon in nyc, and i'm the manager in charge of redo's. just know that it does happen, a lot, and you can go back and they will have to fix it for free. if you are unhappy about your overall experience they may refund you but it's a lot harder to come by. tell them it's uneven but one side is way too short, and ask if you can come back in a few months when it's grown out a bit to have it fixed (at no charge).