Crion,

I haven't found that the GISO makes much difference at all in front of the ID41. I think therefore that the ID41 is designed well to deal with RFI.
I would expect other devices to benefit more though with the GISO. It seems a well built little unit.

I haven't gotten around to putting my GISO on the sale board yet but will do at some time.

Rgds,
Nick