I have to disagree. I think it's a nice feature that shouldn't be advertising itself, it should just happen automatically and silently. It's a permanent redirect, that's what it means, and designers of web browsers know that a lot better than users, so why should users be inflicted with the need to make a complicated decision about something they don't understand as well as the software designers? Especially in the form of a modal dialog that interrupts whatever the user is trying to accomplish.
Unnecessary UIs like this that pop up to brag about a cool feature the developer implemented are a little bit obnoxious. Too many software developers just can't bring themselves to implement completely invisible features. They need to show off about what a great feature they just implemented, even at the cost of confusing people. Really great UI design disappears. It's a matter of taking away, not adding. Is this dialog any better than the Windows Help Find Setup Wizard? [Joel on Software]