I'm not sure how large a font you are looking for, but the 1150 only supports two sizes. There are some screenshots in the review that is referenced in
eBookWise eb-1150 hands-on review. The screenshots are representative of what you get, but for normal eyesight the text is more readable than you might expect. I don't know if there is a way to change the base font size when preparing your own documents (as there is on the Sony Reader).
I assume you have already seen the post:
high Contrast reader. The Web DT 375 CE referenced there might be an option if there was someone with technical skills to set it up right, otherwise not.