Xscope is definitely an improvement over the stock browser, regarding Dolphin though I couldn't say as I never used it. Xscope is really quick, and the only lag I ever really encounter is during the page resizing. Once that gets done rendering (which doesn't take long), the pages all scroll really well.
A few things the video didn't show:
1. There is a built in task killer.
2. Built in file browser.
3. Quick access to clear all browser data, bit by bit or all at once.
4. Runs windowed or fullscreen (hide/show notification bar)
5. Download Youtube videos
6. Developer is extremely quick to work on fixing any issues that pop up.
A lot of these options I believe you can only access in the paid version, but its a pretty cheap app for the convenience it offers. I'm sure there are more options available, but I haven't really dove into the app fully yet.
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