You can visit the site and resize your browser to get an idea. It just scales it down.

I can't be the only one that drags the browser to the side of the screen in order to put it in tablet, and then phone view, and then judges the results!

Will a site laid out for a desktop browser even be readable on a phone?

Does a site laid out for a phone like gigantic on a desktop?

How does it react to different aspect ratios?

Try Ctrl-Shift-M in Firefox.

cmd-option-M on Mac, and if you reload the page it looks really nice ;-)