It reminds me a bit of Windows XP (not necessarily a bad thing). Those window titlebars HUGE!! There seems to be an excessive gap between the top of the titlebar and the top of the text, and between the bottom of the text and the bottom of the titlebar. The titlebars look almost twice the height of the fonts.
This is a real waste of space - and it'll be awkward to use with 800x600. This is why I use Windows XP in classic mode... there is too much dead space on the screen.
Why it is good OS4 is fully customizable :-D