My friend picked up a hair straightener so we've been trying out the rosin tek on some flowers. Largely, it's been a disappointment. Pressed well over an eighth and collectively there was enough rosin for one medium sized dab. We tried several strains ranging from mid to top shelf and only the Gorilla Glue had an acceptable return. The GG nug was maybe 10% of the total weight pressed, yet returned 50% of the total rosin. I'd estimate the GG yielded close to 10%, though it's still only half of what you can get from BHO.
The rosin is as smooth or better than good BHO, but the taste is lacking. Very little of the terpene profile was preserved, so the flavor is just kind of bland.