Hi Neil,
Here’s a picture of page 63 at three different zoom levels (there’s also a 4th larger one – but I’d suggest buying a pair of glasses!)

Once again, my scanner doesn’t show how crisp the text is. At the zoomed out level, I can read the text – but it’s not as comfortable as the next level in. The fonts and formatting all seem the same as when I view on the desktop.
You can reflow the text – but you will lose some / all of the formatting. There’s no rotation option – which is a pity.

I’ve opened PDFs which are 16MB, so it didn’t have any difficulty with this one.

Hope that helps.
PS – Your eBay-fu must be much stronger than mine – I can’t find a single thing that even looks like a USB mini powered light!