I have been running this browser specifically while working on learning web dev for the last day or so. Honestly it serves its function and helps out a bit with prototyping for mobile web as it includes the ability to see what your page / app will look like on both desktop and mobile from phones to tablets in a nice side by side view. I like that. Granted to some its just a re-skinned more convenient version of chrome bringing the dev tools to the forefront but I think over time it could be useful considering its in beta now and its got some nifty features.
To me at least it makes a nice companion to atom.
Take a look if you have not: Blisk