One feature of the KT that attracted me and that I think is important is the storage capacity. Unlike the NST, all of the storage capacity of the KT is available for your use as you see fit, whether the books you load onto it come from the Kobo book store or some other source. With the NST, you have only about 240 MB of space for books not bought through B&N. I don't care for any company dictating how I should use the space on a device that I purchase from them, especially when it involves trying to force me to buy books from their store. Bzzzzt. Sorry, try that with someone else. :-)
A Touch of Kobo blog