I think SF guarniere needs power, I used with gamut d200mk3, it was better than JR concentra I, and better than ARC VT100.
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Agree with Georgemg, the G's are not very efficient and like power to open up. I am using a Rowland 8 that puts out 250 watts per ch and the G's smile, detail is amongst the best I have ever heard. Apparently they also like tube power, although I have not heard them much with tubes. I did hear them with BAT 60's and they were a good match. Jadis makes great amps, but 20 watts is not enough to really drive G's IMHO.