Nothing serious since this is an "exotic" browser, but the editor doesn't load on Dolphin (iPad) and users can't do anything and can't revert to the textarea window.
Don't get me wrong, I've been using this browser for 3 years I think and I like it. But it's not in the mainstream. I don't have figures but I presume most of mobile users keep their default browser. And since the editor is working on Safari & Chrome it might be difficult to find where does the problem come, especially without debugger.Dolphin is not an "exotic" browser. It's very popular on Android devices.
The demo editor in redactor site is working fine in iOS.I haven't been able to find a way to target Dolphin either. The user agent is virtually indistinguishable from Safari under iOS (testing with my phone).
At this point I'm going to have to mark this as a problem with Redactor + Dolphin rather than anything we can address ourselves.