Spectral DMC15SS, DMC30SS Series 2

Hi, I am considering upgrading my current preamp (DMC15SS) to the
(DMC30SS Series 2) and I am looking for feedback from any members
who have compared these two preamps and can share their opinions/findings.  

Thank in advance,

Is spectral gear "happy" with other brands of amp and interconnect?

You will void your warranty with other than Spectral or MIT cables