Oh I have one and love it! I didn't want to attach it to my machines though. I was afraid it would mess up the body if it ever had to be removed. And I cringed (spelling?) when I thought about sticking it to my Featherweights! So I filled a 2"X2"X6" plastic cylinder with marbles and stuck it to that. It works great and can be moved easily.
Check out Ikea also. They have a LED light that clamps on to a surface and has a longer neck on theirs. It's a swift little light also and is in the $29 range.
It looks like you have the Bernina 440? If it is don't you just love the machine?