I bought an eBow Plus a couple years ago, and have had no luck using it on bass. Once in a blue moon I can get it to work but nothing like I see some players on YouTube do (I've seen some people get almost instant response out of their strings!).
I have no issues using it on guitar. I know that bass in general is harder to use it on, due to the lack of bass-fitted grooves and the thicker strings, but I still feel as if it shouldn't be quite this difficult. I generally hold it parallel as close as I can get to the string somewhere between the neck pup and the fingerboard.
If anyone has any tips regarding eBow use on bass, please share them and I will love you forever. Thanks in advance!