yes, I'm from germany too. their store is in my town. they only sell authentic stuff, you can trust them. can't say anything about the shipping costs.
Oh, I forgot: in Germany they HAVE to take their stuff back if it is an online purchase.
I did not know they shipped to US.I just received 2 separate orders from them (Lanvin Flats) without any problems. I am in the US. Shipping was super fast and I did not have to pay any duties.