I tried this combo and I had issues with doubling.
I have had several Geissele triggers and the fit and finish is outstanding, however, I have found the extremely short reset and crisp break of the JP trigger fits my 3gun needs better. It seems to me, that knowing exactly when the hammer wiill fall has helped me improve the accuracy of my shots with the JP over the 3DSD. Everyone is different and I think that variety allows people to find that which fits them best. You can't go wrong with either one, you just have to find he trigger that is most right for you.