I was just thinking that since the Sig 30 was designed to use battery power to theoretically have clean, more stable power, a gain stage bringing power in from the grid might defeat any of that benefit. Also, the idea that every extra component added to the "chain" runs the risk of degrading the sound. But...
I really don't know. I may have heard it in all it's glory. If so, I was just underwhelmed considering how many really like that combo. It sounded good but not great to me.