Maybe if one keeps their kindle face down, or behind a cover or something. it's definitely worth paying extra to remove the extra lock screen though.
The Ad is a book cover they want to sell you or an ad for accessories, gone in a millisecond when unlocking. It's not intrusive, definitely not worth paying £10 to remove.
no, you will see the ad whenever you look at the kindles screen. instead of displaying the book cover of whatever you're currently reading. furthermore, it will actually add a second lock screen layer.
If it is with Ads, after a month of purchase you can call Amazon and tell them that the Ad's are annoying. Amazon customer care will then remove the ads for free. I followed the same process and my kindle is now ad free.
Not sure why everyone is so against the Ads version. It's usually just a book cover that you see for milliseconds whilst unlocking