Classe Sigma Mono's

I have heard these amps and thought they sounded great but I would like to hear specifically from owners of this Classe amp as to their thoughts and hopefully a mini review as I'm very close to making a purchase. Please help out.
I used to own the Sigma AMP2 but sold them to free up funds for bigger purchase.  I thoroughly enjoyed them during my time and wouldn't mind owning them some day again, specially due to it's size and weight.  Even though they are class D amp, they sound better than a lot of other amps I've owned (e.g. Anthem, Emotiva, Parasound).  Only my Classe Delta and Pass Labs amps were better.