Also, the 86U is supposed to be older model than the 87U...but they work the same to me. I have the NumLock thing on my Thinkpad T43 keyboard, but I've never used it. I'm fairly efficient with the 1-9 on the top row, if I go slow enough, but I find the 7,8,9 and 4,5,6 and 1,2,3 in a slanted position kinda awkward to use. So I have no gripes about the 86U that I have, which is now an all 45g board for all intensive purposes.