Well, regardless of how tall 36 and 72 pt type should be, I find that that on the Jetbook, the 36 pt is rendered at about 1/4" for a capital letter.
Alas, I also found that the fb2 support is somewhat less that it should be. One character, I believe it is — which should be rendered as a longish dash is instead rendered as an empty box; I think the real problem is the currently supported font doesn't have that character. Easy enough to code a work around in the conversion script... but a little disappointing.
I quite like the device, but I have to say, this is not an ereader for one who is not tech savvy. Certainly if one wants to read anything new, at least until they increase their support or develop conversion tools, one needs to be prepared to do the work of converting oneself into a compatible format.
Fortunately, I am making progress on PDFs

. My pages are just a little too long for the screen right now. I hope to have that figured out soon. There is a slight lag on page turns for PDFs (while there is none with fb2 and .txt files). I would say the lag is under a second.. say no worse than a page turn in eInk (and without the flash).
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Bill