I didn't get the S9 keyboard book cover. I already had the Tab S7/S8 keyboard book cover. Initially, it didn't work. It gave me an error telling me this keyboard is not designed to work with this device. It was erratic and didn't work. However, after the first update, I tried again and although I get the same error, the keyboard cover works great. All of the keys work and no erratic behavior from the track pad. I got the Tab S9 book cover so all I have to do is pop off the cover and pop on the keyboard. The only downside (so far) is that when I close the keyboard cover it doesn't turn the display off. Since I saved a couple hundred dollars, I think I got the better deal.