Woo WA22 1st Generation versus New Generation

I have an opportunity to buy a Woo WA22 1st generation and would like to know the differences between it and the 2nd generation. I had been considering buying a 2nd Gen but now considering a 1st Gen. I I know that the 2nd Gen has an XLR output for a power amp/speakers.
But, does the 1st gen. sound as good? Other than the XLR outputs, is the quality of circuitry different or better on the 2nd generation?
I understand that the toggle switch enables the switch between RCA/XLR inputs. Does this mean that a XLR/RCA adaptor or interconnect can be used to connect to a power amp to power speakers?
Any comments would be most welcome.

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