Yes, I have a press. I have used both rosin and etoh extract done for carts decarbed for cbn. To get the THC to CBN, I decarb it for 4x what is normally needed at a given temperature. I have never had the results analysed, so have no real measure of CBN content after that. When you decarb for CBN, how do you do it, especially the time at time used rather than if you were decarbing normally.
So far, I do not notice a whole lot of difference in effects between the cbn decarb I do and the same strain decarbed normally. However my sleep medicating is still a work in progress. I have never managed to find consistent sleep results no matter how the stuff is processed. I have tried vaped flower, vaped rosin (decarbed for CBN, normal decarb for thc, and not decarbed before vaping), and vaped carts (from etoh extract, decarbed for THC, and decarbed for CBN). Sometimes it puts me to sleep all night, sometimes puts me down until I re-dose in the night, and sometimes (not often) does not seem to work well at all. It would be nice to find consistent all night sleep results, but perhaps that is too much to expect.