I don't have an Ott Light, but have a Kodak (I think) that I bought through Sears online. It was cheaper than the Ott and I didnt have to go out to buy it. I'm pretty sure it works the same as the Ott or given that the Ott is primo, probably better. That being said, if it weren't for this light, I probably couldn't knit at all in the evening. And perhaps on some days. I was having problems seeing the stitches in the evening and would turn an ordinary 3-way lamp all the way up, tilt the shade out of the way and drag it as close as possible. The Ott gives off a really nice "daylight" light and makes it easier to see my work. If it disintegrated tomorrow, I would definitely replace it immediately.
I have the floor model and the light comes over my shoulder onto my knitting. It's perfect for me. I would highly recommend purchasing it. And at 40% off, such a deal!!