Big? Not by any means. Sure it will have an extra edge, but the 200mhz increase certainly won't be a dramatic change. I haven't even used anything on my phone yet that would likely benefit from a bit of speed boost. Maybe... maaaybe Google Earth. It works fine on my phone but I guess could be a pinch more fluid. Other than that though I've never had any personal slow downs or issues with the speed. I'm just waiting for the day they bring dual core processors to phones. But again, personally I don't know when the heck I'd ever need it. Not like I'd be playing full on 3D games on my phone nor doing graphic rendering, music writing, or anything else that really needs all the power you can provide.
Rev.