I've never thought they were a good buy at $1800.00.
They are just a POF upper on DSA's complete lower and when you look at that you can get the same upper from POF for $1250.00 or less from an outside dealer, than get yourself any lower you'd like to put it on and do it for cheaper with more choices.
That's the way I did it and came out at about $1500.00 total for the upper on a Mega lower/Stag parts kit.