Well...
Here are a few results, I would still like to measure the risetime and accuracy.
The noise is good, the delay is very good, but the linearity leaves a lot to be desired.
Fluctuations of +/- 0.5dB, as with the Tek Probe, are still acceptable to me, but this...
I'll try a few more things at the weekend.
As things stand now, I wouldn't want them.