Yeah.. they're kind of bad really... I had one for a spell... really nothing good about it other than portability and the fact that it did technically vaporize weed. It didn't do it very well, or very evenly. And unlike a bowl where you can snap a bit of lighter on it and then get the flame away, you have to sit there inhaling a post-butane-flame spout the whole time you're hitting it.
I know it seems convenient to take batteries out of the equation but it's not very realistic to do so. There are several competing products that would be more worthwhile if you go electric. Maybe not quite as cheap but hey, you get what you pay for sometimes.