This keyboard appears to have amajor design flaw; if youhit the space bar at either end (15mm) it does not work. This means that30mm of the 108mm spacebardoes not work,or 28%. This isthe result of me touchtyping; Iam not messing around. Unfortunatelyit makes the keyboard absolutely useless for myneeds. Check out the Logitechforum, it's not just me.
UPDATE I had one replacement from Amazon, which also had this problem. I then called Logitech direct who were very good and immediately sent me another replacement. Space bar is fine. They advised that there had been a faulty batch sent out?!