I also ordered from McMurray this year.  All crested breeds.  I was extremely happy with the delivery, packaging and the health of the birds.  I did have 1 that did not survive, but she just failed to thrive which isn't their fault, it just happens.  All 26 birds were sexed pullets and they were 100% correct.  I would not only buy from them again, I would recommend them to anyone. 
I have to say though that I did order ducks from Ideal last year and was just as happy.  All did very well.  They just don't offer the sexing of many breeds like McMurray and I am not in a position to have roos here.