I would order from them again. A few people have had customer service issues with them, but MPC has been on here posting that they are hiring new employees so maybe it is an issue they are addressing? I don't know, but I suspect they were under staffed for a time, but that is just conjecture on my part.
The important thing is that I would order from them again, as I think most here have said they would. One of the biggest pluses with them is that they have a great website that is very user friendly. It is a big convenience, to me anyway, to be able to order online and know exactly when something is available for shipping. The birds I got from them are good quality. There were some sexing mistakes, but that is to be expected (they only guarantee 90% correct, which is pretty much standard with large fowl) and really has more to do with the hatchery than MPC (and I would order from Meyer as well). I don't know of anyone else that sells sexed bantams because it is so hard to do and I sort of expected there would be some incorrectly sexed birds.
Overall though, I am pleased with the birds. They are higher quality than most of the hatchery stock I have ordered before. They definitely look like what they should (a big step over some hatcheries) and some of the varieties I got are fairly comparable even to a lot of what I have seen from breeders breeding to the standard. That, in itself, is pretty great for a hatchery.