I bought mine on Amazon also from A.M. Leonard (after reading about it on this forum). I didn't know it was perforated. It took some adjusting after working with regular parafilm, but now I much prefer the perforations. No fumbling with scissors and a roll. The tape stretches to 8xs its length, sticks to itself, tears off where I want it to stop, and makes a tight seal.
The only problem I've had is that I enjoy misting my cuttings often during the day. One of the cuttings became too consistently wet and developed a fungus infection under the tape, which quickly spread over the whole twig before I caught it. It probably would have happened without the tape, but I've had to cut back a lot on misting since it's not needed and can even be harmful.