Haven't yet used them. However, probably in the next audioXpress issue, my letter and Dennis Colin's reply probably appears, about the resistor error (this discussion is buried here in the thread about the Jung current source article), and discussion of input C for his measurement preamp, and mentions that the noise he measured for these parts was not quite as good as LIS claims, and recommends that if that is a concern to get a guarantee from LIS.
He adds that noise measurements are tough (amen to that) and his might be a bit off IIRC.