Rated 4 out of 5 stars
I just installed it, so I haven't gotten a chance to use it much yet, but there needs to be a way to adjust the font size for the whole CHM file (as opposed to adjusting the font size on every single page, which can get annoying with a large file with hundreds of pages)!
Yes, I saw the workaround where you set Firefox's minimum font size in the preferences, but you shouldn't have to do that. On FF, when you adjust the font size of a webpage, it keeps all pages on that domain adjusted to that size. This is the functionality that is missing.
Other than that, it's great so far (but like I said, I haven't used it much yet).