Hi, I was lurking here and I ran across this post so thought I'd answer since no one else here seems to have actually used the vape-pen WITH the herbal liquid sold to be used with it. I have used it only with the recommended herbal liquid, so I can't answer any questions about whether or not it will work with home made liquids. From what I have read and heard, home made liquids will gunk up the pen, but I haven't tried that.
As to the Vape-Pen used with recommended liquid herb that is sold to be used in it, it works like a dream! (a Blue Dream, actually!)
I carry mine in my shirt pocket like a pen and wherever I am during the day, if I want a little herbal lift, I take a few puffs. As a medical marijuana patient, it helps me relax and helps me deal with chronic pain. One thing I really like is that I don't have to run into a bathroom or otherwise hide, I can do it walking across a parking lot or even in a store.
One thing I like about it is that it can easily and quickly give me just enough of a dose that I don't feel overly medicated, I can still function, yet it "takes the edge off" for me as I run my errands or what-not throughout the day. Of course you CAN get pretty baked with the pen if you wish, too, but that's not the way I use it. If I want to get really baked I'll do so at home with my plug-in vaporizer.
So I just wanted to say, "Yes, someone has tried it" and "Yes, it works great!"