My friend and i shared and order from MPC of 12 bantam pullets (EE's, brahmas, cochins, and barred rocks) and 2 large size welsummer pullets. All chicks arrived in great condition, feisty and healthy. They are 3 weeks old today and we've had no losses. I think 2 of the brahma bantams are boys, though.
Customer service has been good - we had a lot of questions at the time of ordering, and they were very nice and informative. The chicks were shipped on a Monday and arrived here in Massachusetts the following day. This is the least time in transit in my experience, which probably explains why all survived. I once ordered from McMurray: Birds were shipped on a Saturday and did not get here until the following Tuesday. Several were DOA, and a few more died within the next few days. Have also ordered from Ideal: Birds spent 2 days in transit, and I think 1 or 2 DOA.
For me the reasons to order from MPC is the 1-day transit time, at least to MA, which means they arrive in better condition, and the sexed bantams, but I cannot comment on the latter until I see what sex all our birds really are. I will post again when we know.