There are a lot of questions. F31 is good, the price is relatively good, and the price/performance ratio is better than F21.
Hanvon's electromagnetic screen is patented, so it will not respond without a pen. Generally, Hanvon electronic paper books with pen touch have dual screens: 1-ink screen and electromagnetic screen.
In fact, I feel that there are many good-looking electronic paper books suitable for girls, and the price you mentioned can basically cover a lot of them: take a look at the new iRiver Cover Story wifi version, I think it is also very suitable for you, the price is about It's around 2300, not much different from F31.
PS: F31 is built-in for browsing other web pages, and Avery and Cover Story wifi can send and receive emails.