Not much to say. The manual in 1.4. was:
1) Faster and more responsive (jumping between tabs, searching for keywords)
2) The font size is too large in both the left and right pane. I know you can control + zoom, but really..
3) Clicking on articles seems to take a lot longer, you get white "flashes" when you visit pages.
4) A minor thing, but I liked the green color better than the cyan/green .. not a huge problem though
I found that the manual was more readable than in GMS2, but maybe that's just me?