I purchase a pair of these a year ago and they have been one of my main articles of footwear since, everyday life and costuming both.
While I am on the short end, these boots are quite tall-reaching up most of my thigh if pulled tight. They quickly developed a fair bit of slack, though, and the tops usually are just a few inches above my knees.
The slack only gets to be a concern when you roll the cuffs down or are moving a lot: they sometimes will give way and sag much further down, especially in significant cold for some reason.
The inside of the boot is fairly sizable-by necessity to get your foot in, given the lack of parting with laces or straps. This can sometimes make your footing a little less stable, although wearing large, cushioning socks suck as thick wool socks or stockings or chauses remedies both this and the slack of the boots quite well. If you plan to wear the cuffs turned down frequently, I recommend considering a pair of garters worn just below the knee (which is period, anyways) .
Otherwise, it is at worst passable for historical accuracy, great as rainboots (pig leather is naturally water resistant) and even everyday wear, and at a good price for genuine leather boots of this height. On sale, the price is outstanding.