So far, I've had two pairs of pants and two shirts altered and everything is perfect. As mentioned before the gentleman there did work for Danier and Harry Rosen. He was also working on fixing jackets from Bench.
Do not bring in box pleated or darted shirts (in the back) as they are not really fixable. My shirts were French seamed properly up into the armpit, like you are supposed to do.
Sometimes the clothes are dropped if weren't ready when he said they were going to be. I had told him they were not priority and he had gone above and beyond for a bride and groom with a ridiculous 24hr request.
I'd call first before picking up and if there was a rush needed, I would specify on drop off.