It looks like a competitor. Pik has a UI that's in the browser window rather than a pop-up prompt, which allows you to search for commands. Pik also shows you what commands are popular on a given site/page, which makes it easier to discover commands.
I just installed it. I don't know how much I will use it, but it's definitely something I would use, if that makes sense. Readability, bugmenot and google cache are all things that I've never bothered to make easy before.
I'm using Chromium 4.0.299.0 (36335) on my Mac and I get that popup too.
According to jeresig, author of jQuery, one should not perform browser detection, instead you should use feature detection. Browser agent is not going to give you an accurate picture of what is supported because every browser likes to say they are mozilla/webkit/netscape/etc.
Also add Namoroka and Minefield, test versions of Firefox. Instead of whitelisting, can't you run some test code client-side and only prompt when you're sure the browser doesn't support it?
My understanding is the prices are high because there's an oligopoly. To have competition, all the major browsers would have to agree to let in more companies, and they're just not doing that.
Sorry, but that's incorrect.
The major browsers will let you in - you just have to pass all their audits, comply to all their regulations, and commonly have a WebTrust audit....which can set you back mid-$xx,xxx.
All browsers/OSs are accepting new roots all the time - check the Mozilla dev lists/Bugzilla and you'll see.