Regarding DrumCore3, I have upgraded to the full product and initial behaviour was great, dragging and dropping audio and midi etc., until I tried to save the file: Sonar crashed and I lost my whole session. This happened repeatedly, even if I just opened a file, inserted the soft synth and then immediately tried to save without doing anything else.
Then I assigned jBridge and all has been fine and I can get on with creating - and saving - drum tracks.
But I hope that the new owners of DrumCore will develop proper 64-bit compatibility - they haven't said they will yet...