I will reply here, since you ask good questions:
They have the standard Binding posts and RCA inputs. Upgrading to the higher end WBT binding posts wouldn't take much effort.
The caps outside of the PCB are Symphonic Line.
I am not the first owner. But I was told the age of the Kismet upgrade from the seller and would place it around 5 years.
Admittedly, I am not an expert on Odyssey Amps. I will try and answer what I can. I had the amps for about a year, they sound great. No problem driving my 800 Diamonds.