I think the consensus has been generally good on the latest releases of CA 94s.
But as for the flat - it's only going to be cost effective if you are rolling it yourself. You're right, if you pay to have it done, it will meet or exceed the price of the clones.
I have two of them, one will be an MP5, one will be an MP5SD. One of these days, that is. I still am lacking some major pieces of equipment to do the builds.