Here's a Veronica 'Charlotte' that just rooted. These rooted in less than a week in this thing!
I have a new tip to share. I use Clonex gel, but I do it in a different way now. I take a small amount and add it to a cup with a little water in it. I mix this up. I take my cuttings, and stick the tips of the stems in this water over night. Since doing it this way, I've had much better success. I'm sure other gels will work. If I have a cutting that is rooting too slowly, I take it out of the machine and stick it back in the Clonex water for a few more hours.