Paradigm Sig-1.5 30 - WTB - Opinions

Anyone have any experience and thoughts about the Paradigm Sig-1.5 30 in-ceiling speakers?  Better yet, anyone have any for sale (used or new)?

The plan is to use them in conjunction with Paradigm 3F towers in the front and Millinia 30 for center (over fireplace mantel).  This is a new home build and plan to use the Sig 30s as our rears (and atmos) since our kitchen is open to the living room.  Our audio guy mentioned using Goldenear, which I hear great things about, but am a little hesitant on mixing Goldenear with the Paradigm fronts.

Thanks in advance for everyone's input!