Lack of an on/off switch does not bother me, but it would have been nice, I suppose. Other similar lights have an on/off switch.
I recommend one made by belkin that clips onto the top of the screen, and has a coiled wire that stretches pretty far. It won't come out of position.I love this gadget: It's solid, reliable and works Once I went to broadband wireless networking, computing in bed or out on the porch was a natural. But, I'm not a touch typist and couldn't see the keyboard. The Flylight was the perfect solution. It casts a bright, cool light where I need it. Ample to see the keys but not enough to annoy my sleeping spouse. What still amazes me is how solid and well-engineered it is for as little as it costs. The gooseneck is long enough to reach my rear USB ports and snake around a very large screen while staying where I put it. I don't miss an on/off switch because it's the kind of thing you pull out when you're done with it anyway. Personally, I'd be leery of anything that clips onto the top of my screen, for fear it may cause a problem when I close my laptop.
Because it is solidly constructed, I just coil it up tight and throw it into my case when I travel. Mine's as good as new, even after more than a year of rough handling. Kudos to Kensington on this one.