Well built and sturdy while also sleek and lightweight, this device is a joy for anyone who flourishes typing with laptop keyboards. It didn't take much thought for me to buy second one of these keyboards for my large rolling laptop case, and the travel version (31P9490, identical to this model, except minus the number pad) for my carry-around bag.
Key action is fast, uniform, and comfortable. Its professional and attractive design is a refreshing change from the glut of overly-buttoned contraptions around these days. For those with space saving issues, the USB ports and option to do away with a mouse with TrackPoint are definite plusses.
I have only two caveats, neither of which are really critical. First, although this is a full size board for the character and numeric keys, the layout and size of the lesser-used keys (insert, delete, home, end, page up/down, cursors, etc) are a tad eccentric and will feel small and misplaced to an experienced touch typist. In particular, if you normally use Ctrl key shortcuts by touch, you'll find yourself often hitting either the cursor keys on the right or the function-shift on the left -- which I'm still not completely used to yet.
Second, if you place the keyboard on a slick desktop (my own is on a metal shelf), the board will slide about considerably -- which I remedied with a couple of rubber grip stick-on buttons from the local hardware store.
But overall, I must wholeheartedly concur with all the previous postive reviews. If you conceive yourself a discriminating typist who uses only the best, you won't be disappointed here.