I have experience with them. It's a scam.
They actually have quite a few good reviews all over the net - which is why I chose them. However after my experience I have to wonder if most of those reviews were legit. The whole this was horrible. They seemed to have no idea what they were doing (I knew more from sewing with my grandmother), the quality was terrible, and I had to go to the shop several times for this (practically daily for about ten days). Oh, and did I mention the quality was terrible. Like embarrassing. Rough seams, no shape, no canvassing, below average fabric. And shockingly horrible cutting, particularly bad considering just how many tries they have. They try to get your money as early as possible. I insisted on holding on to half, but they made sure that they 'ran late' and had to drop it off for me late the night before I left - they insisted it would be fine ("easy, final adjustments"). So they made me pay earlier in the day, then dropped off a coat that actually looked worse than I left it. And they left it with the concierge so they wouldn't have to answer for it until I was out of the country.
These are bad people. They will waste your time, take your money under false pretences, and smile at you the whole time. Make no mistake, you won’t get what you asked for, and will get dragged along until you give up on account of leaving the country. They pray on your trust, and victimize you for your cash.