I'm a customer of Stephen Lachter. A few thoughts:
1) Almost all of my shirts are semi-formal, with a couple of casual ones thrown in. Never had a problem with Stephen WRT style, collars, cloth selection, etc. He definitely knows what he is doing.
2) Delivery time varies *a lot* -- from a couple of months to several months.
3) Shirts are made in London, in an outside workshop (not owned by Lachter). Needlework is good, while not stellar -- same level as O'Flynn, Budd,...