I think the number of people who own a Samsung Chromebook far out weighs those who have an Acer Chromebook (due to the delay). Still, I know there are some Acer Chromebook owns lurking around. Hopefully they will see your question soon.
The screen is fine for me. I have been using net-books for a few years and I may be used to the smaller size more than most people are. Still with the font and the screen resolution used it seems fine to me.
I love the screen size. Its bigger then most netbooks and tablets yet small enough to take around with me and when Im at home to watch Directv on it in the bedroom and play some games. Overall Im very happy with the price and device.
I'm coming from a 17" Dell inspiron laptop, and I don't mind the screen size one bit. The overall size and weight difference makes the Acer far more convenient. My Dell always took up so much room on a table, like in the cafeteria at school, and it weighed so damn much I never wanted to bother pulling it out. Overall, I'm beyond satisfied with the dimensions of the Acer.
I use a 23 inch (1920x1080) monitor, and a 27 inch 1080 LCD TV that work with my eyes, when using the one of the desktop on my home network.
The Acer's C7 smaller screen has a vertical of 768 pixels and I find that limiting. That said I put up with the old fashion 4:3 ratio (1024x768 resolution) LCD monitor for many years. I like the 16:9 ratio, works well with films/video and seldom has black bars on the top and bottom unlike the 16:10/16:11 ratio. The screen ratio is one of the reasons to have one of these wonderful light weight Chromebook systems.