The Bountysource browser extension is similar. It works with existing votes and +1's from GitHub, Bugzilla, Trac, etc.
Anyway, you're right, it is similar. FeatHub doesn't require an extension though, so you can just point your users to your project's voting page.
(Disclaimer: I have no product or customers to worry about, just musing)
You can still direct users to the Bountysource page for your project if that's what you prefer.
(I'm not associated with Bountysource at all - I just think it's pretty good at what it does).