The Kobo seems to have copied BN's refresh every 6 pages, since at the product launch the videos showed screen refresh with every page. Then all the ghosting issues came out, so they had to scramble to find a solution. That update really improved the page turns and swiping somehow, too, which was unfortunate, because all the lukewarm reviews came out before the firmware update (I was even about to return mine the day the update came out). They also have mentioned fixing dictionary issues, adding more fonts, and adding line spacing/margin options, and they'll probably spiff up the browser eventually too. They also upgraded their desktop software, which used to be quite awful, but now it's pretty decent for shopping and managing content (I used it for the free $10 gift certificate when registering the Kobo). I'm impressed with the developers braving the nitpicking and 'when are you going to fix this?' demands on here, but they are at least responsive, and even supply a list of all the developers on the Kobo device menu.
I'd think it would be awkward for BN to fix the ghosting problem by offering a screen refresh option, since it was one of the distinguishing features it advertised over the Kindle. I like the Nook, and even convinced my sister to get 3 of them for her kids (and return the 3 Kindles she bought), but I prefer the Kobo for the lighter weight, smaller form factor, nice ergonomic feel, non-book-pimping top screen, and data-geek fun of reading statistics and silly reading awards.