I use one a lot, listen to my bandcamp and soundcloud pages. It'll work on any string, not just the high ones, and any gauge, I use 125 to 30 flat wounds.
It's all down to practice.
Make sure the eBow isn't touching the string at all, if you're not getting it to work it could just be that.
Just stick with it and you'll soon be making some very cool and unbass like sounds 🎅.