I bought one in the '70s when I was in high school - more of a gimmick than anything else IMO, I don't even know what I did with it -probably gave it away. I think I paid $12 or so for it. It will NOT take the place of a wah pedal, or a volume pedal, or anything else. It's pretty much a one-trick pony.
The ads at the time used Page as a spokesmodel, but he denied that he actually used it later in print interviews. FWIW - Page actually did use a 'real' violin bow live. Don't know about recordings though.

Like so many guitarists, I was looking for a way to knock off bowed string sounds - unfortunately, the eBow didn't cut it.